This issue of the YA Hotline explores the prevalence of mysteries in YA literature. It explores the different books published within the genre through a thematic bibliography, book reviews, and an examination of trends. It also considers why mystery novels are often adapted into different mediums, exploring film, TV, and graphic novel adaptations. The issue also offers programming ideas related to mysteries for librarians. Finally, it includes interviews with a police officer and a YA author to gain different perspectives on mysteries.