'Once a Monster' by Robert Dinsdale is a captivating and thought-provoking novel that explores the nature of humanity and what it means to be a monster. The story is centered around a young girl named Nell, who accidentally discovers a body on the shore while mudlarking. It’s not the first corpse she’s encountered, but it certainly turns out to be the strangest.

One of the strengths of 'Once a Monster' is the way it balances the fantastical elements of the story with very real, relatable emotions and themes. The characters are complex and fully realized, and their struggles with identity, family, and love are universal. Dinsdale's prose is both elegant and accessible, making the story a pleasure to read.

Another strength of the novel is the world-building. Dinsdale has created a rich and detailed mythology that intermingles with the more realistic yet dreary representation of Victorian Britain. The way he weaves this mythology into the story adds depth and texture to the narrative - a richness that easily holds the readers attention.

Overall, 'Once a Monster' is a beautifully written and emotionally resonant novel that will appeal to readers who enjoy both fantasy and literary fiction. Dinsdale has crafted a story that is both entertaining and thought-provoking, and his characters and world-building will stay with readers long after they've finished the book.