"Sipolan Aapon kosioretki" is an exciting detective book by the Finnish writer Jussi Adler-Olsen. In this book, we meet the difficult cases of the main character - detective Markas Cobra. He decides to take up the investigation of a crime of great importance to the local village, which hides many secrets. The literary skill of Jussi Adler-Olsen impresses with his ability to weave intricate plot lines that keep the reader in suspense until the last page. "Sipolan Aapon kosioretki" is a book that will definitely capture your attention with its mystery and unpredictability of events.