Definitive rankings of the best sci-fi crime novels ever written based on curated lists and suggestions from readers and authors.

Based on curated lists from BookBub, Crime Reads, Book Riot and more, suggestions from readers on Goodreads, Quora and Reddit, and recommendations from authors like Jasper Fforde, Sharon Shinn and David Brin, here is a roundup of the 81 best sci-fi crime novels ever written.