Everyone This Christmas Has a Secret feels less like a full third installment in Benjamin Stevenson’s Ernest Cunningham series and more like a holiday special — something Stevenson and Ernest both lean into openly. It’s noticeably shorter than the first two books, and Ernest even frames it as a kind of “Book 2.5.” That framing works surprisingly well, especially since this entry feels more original than Everyone on This Train is a Suspect, which leaned a little too hard into Murder on the Orient Express territory for my taste.