Art and Mimi are united by the tragic death of their parents, and Mimi feels she is not important enough and must care for her brother, a mathematician, who is very dependent on her.
But she feels drawn to gain more independence and also would like to find love, as she feels lonely.
The first step is to quit her boring job at the museum and start working for her best friend. Then she joins a dating app, of course her brother has a theory on how many men she would need to meet before finding the one, though the theory is tested when she meets someone at a reception she is dragged to by Art.
Is this person too good to be true?
And will Art solve the mathematical problem he has been working on all his life?

What a lovely book, though I struggled to understand the maths discussed in it, I enjoyed reading about the relationship described.
I found the different point of views, as the story is narrated via different voices, a bit confusing at times.

This book was surprising. I was expecting a standard sort of rom com with the hook being that the maths genius brother tries to help. In fact it's much more than that. Exploring family ties, secrets, misunderstandings and responsibilities.
The central relationship between siblings Mimi and Art is complex. A bit like the mathematical theory Art is working on!
The direction the story took was a surprise to me and then there were more surprises in the way that it all turned out.

Mimi and Artie are brother and sister united by the loss of their parents. Mimi feels she needs more in her life than just looking after her brother, who is a genius, but has special needs. At the agrees to help her, but he gets upset when she goes off the plan to follow her heart. At the back of it all is the tragedy and unanswered questions from their parents death. Interesting and quirky

The theory of not quite everything is like no book I have ever read before. I just felt so uplifted reading this beautiful story. If you like big hearted stories pick this up.

Charming and witty and moving. I really enjoyed reading this! I loved the characters of Mimi and Art and the book covers so much ground - love, loneliness, family, fear - while remaining warm and open.

The Theory of Not Quite Everything by Kara Gnodde is a debut book by the author and it is a delightful and moving book about a brother and sister, Art and Mimi Brotherton.
Art is a mathematical genius and Mimi looks after him and has since the death of their parents.
Mimi is looking for love and Art develops a strategy for Mimi to look at the apps available to find a suitable boyfriend. Mimi however finds Frank the more traditional way and Art distrusts him.
A delightful debut and an enjoyable story.
Highly recommended

Art and Mimi are siblings who live together after their parents died in a suicide pact when they were children. They have always supported each other but now Mimi wants to find a partner and Art, a mathematician, devises an algorithm to help her. When She meets Frank, Art doesn't approve because the meeting wasn't in the plan.
An unusual book with neurodivergent themes. Worth a read

Mimi and Art are adult siblings who have lived together in their childhood home since their parents' suicide pact 20-odd years earlier, an event which has left its scars on both of them. Art is a genius mathematician, with what come across as autistic traits though this is never spelled out in so many words. He is wedded to his routines, very literal-minded, and hyper-focussed on his life's work to prove a mathematical theory. Mimi is very different - creative, more impulsive, and getting rather lonely. When she meets Frank at a mathematics conference where her brother is being awarded a prize, they hit it off immediately and start seeing each other. But Art becomes convinced there is more to Frank than meets the eye, setting the scene for a rom-com that nevertheless touches on some serious themes.

This novel was lighter than many books I normally read, without much depth in the characterisation or indeed the way that the big themes of neurodiversity, suicide and loneliness were dealt with. It's an enjoyable enough read, but fundamentally a bit of fluff in the vein of Bonnie Garmus' wildly popular Lessons in Chemistry. Of its type it is perfectly fine and will no doubt be enjoyed by many readers; it didn't quite do it for me.

This was a fascinating book, where a mathematical theory took over the life.of a young mathematician,. The story overall, covers the love, lives and deaths of members of his family and their efforts to cope with the problems that life throws at them, A great conclusion.

Art and Mimi Brotherton are brother and sister. They live together bound together in grief for their parents. Art is a mathematical genius, while Mimi is creative and searching for love. Art agrees to help Mimi with finding a soulmate using a dating app, but using mathematical principals. But life gets in the way........A clever and uplifting novel about love and siblings.

A fun read. Mimi meets Frank, but all is not as it seems as secrets unravel for them both. An engaging read. Looking forward to more books from this author.

Mimi and Artie are brother and sister united by the loss of their parents. Mimi feels she needs more in her life than just looking after her brother, who is a genius, but has special needs. At the agrees to help her, but he gets upset when she goes off the plan to follow her heart. At the back of it all is the tragedy and unanswered questions from their parents death. Interesting and quirky

The cover would certainly catch my eye and make me pick it up in a bookshop. The story focuses on a sibling relationship and how their childhood has influenced that relationship. An enjoyable story with characters who are likeable and it is easy to follow. Thank you to Netgalley and the author/publisher for this ARC.

I loved the characters in this book. Brother and sister Art and Mimi are devoted to each other following the death of thier parents. Art is a mathematical genius but when he tries to apply an equation solution to his sister's search for love will it work. Great read.

The story starts slow and I was close to give it up, but still the synopsis reminded me to give it a chance. I gave the story a chance and in the end I actually liked it. I loved all the mathematical references found in the chapter titles. Still, what I didn't get in the story is story of the siblings. They have a relationship that I would expect from twins. A lot of times during the story I had to remind myself that they are not twins. And I didn't understand why the young sister have to take care of her brother who's 6 years older than her. Maybe because he was so absorbed by mathematics that his sister felt responsible for it. I give it more points because Frank addresses this issue. Anyway, apart from this tiny aspect overall was good story and I am glad I didn't give up on it.

Mostly a good read. This book grabbed me from the off, but later I found my attention wandering before it picked up again. It is about 2 siblings , orphaned in young adulthood who live together. Art is older and a mathmatician. He is also on the autistic spectrum. His sister, Mimi , meets a man and falls in love though the relationship with her brother adds extra problems to the relationship.. More so when her brother is involved in a traffic accident where her boyfriend is driving the car.
In the chapters leading up to this point, I felt that the book bumbled on a bit too much. The scene setting was good at the start, the dramatic turns too, but joining them up could have been better.
The characters are well portrayed. The story is told from different viewpoints and time periods, which worked for me .I look forward to reading more from this author
Thanks to Net Galley for the Arc in exchange for an honest review

Well this was an emotional rollercoaster from start to finish. The story follows siblings Art and Mimi, who are left to care for each other after their parents' supposed suicide. This was very thought provoking and the characters were written beautifully with complexity and authenticity. Very enjoyable

I enjoyed this more than I thought I would. At one point I thought I knew where it was headed, then I thought it was going in a different direction, then again I thought I could see another plot twist coming up. I thought it dragged a little here and there and ultimately I became frustrated with some characters, but it was good.

What fantastic characters!
I love the sibling relationship between Mimi and Art, established in childhood and cemented in tragedy the pair look out for each other in their own unique ways.
Art relies on maths, patterns, algorithms and Mimi to navigate the world and Mimi is torn between supporting her brother and finding love for herself.
Enter Frank, the mysterious stranger at a maths conference who attempts to sweep Mimi off her feet despite Arts reservations.
A thoroughly enjoyable read, yes a romance but so much more an exploration of relationships.

The Theory of (Not Quite) Everything tells the story of Art and Mimi Brotherton. Art, a neurodivergent, lives with his sister Mimi. They have depended on each other from an early age after the untimely death of their parents. Art is a mathematician who believes all life's problems can be solved using mathematical formulae. Mimi is becoming disillusioned with her life and wants to move on. She leaves her job at the museum and goes to work with a childhood friend, Rey. Mimi also thinks it is time to live independently from her brother and start a family.

Art thinks that Mimi should use mathematical principles to find a partner. Mimi agrees to Art's suggestion to alleviate the inevitable change that he will face. Things become complicated when Mimi meets and falls in love with Frank. Frank seems perfect, but Art distrusts him and sets about finding proof to back him up.

I loved reading this book and praise the three-dimensional characterisation employed by Kara Gnodde. The book will be ideal for book clubs. There are several topics to unpack - grief, guilt, abandonment, friendship, fear, romance, loyalty, etc.

The theme running through the book is mathematics but not enough to put anyone off. The book is captivating and has twists and herrings to keep you turning the pages until the end.