Gill’s “Boy Fallen” is touted as a mystery thriller, though I would personally categorize it more as a mystery due to its slower pace, which doesn't align with my definition of a thriller. The novel follows two detectives as they attempt to solve a second murder case in a small town in New Zealand. One of the detectives, Brooke, grew up in this town and was personally affected by the initial murder of her brother, which spurred her decision to become a detective. Brooke's deep connection to the town adds a unique depth to the case, bringing in a network of relationships and insights that might otherwise be missing.

Gill’s talent for keeping the reader guessing until the very end—quite literally the very end—is commendable. While I found the pacing slow at times, the book was still an enjoyable read that isn't too difficult to get through.