Tacit is a suspenseful thriller that follows a woman named Lynn who witnesses a murder while on a boat with her husband. The story spirals into a tense and clever game of cat-and-mouse as she tries to prove what she saw while the killer closes in, all while her own memories and trust in those around her begin to unravel. Readers enjoy it for its tight, claustrophobic atmosphere, sharp twists, and the gripping moral dilemma of whether to stay silent or speak up in the face of danger.