A victim found inside a sealed home that even the most seasoned investigators can't explain — and every 'perfect' crime is only the first move. Rangers Baker and Tate race against time to stop a brilliant but deranged psychopath whose ingenious locked-room murders grow more impossible as the body count rises.

A dogged small-town detective is found dumped on a remote ranch, dead from chasing a case nobody else believed in. As Rangers Baker and Tate retrace his final weeks, a book club of true-crime-obsessed women called the Bloody Bookmarks crosses a line that can never be uncrossed — and the line between victim and killer has never been harder to find.