One of the hundred books a year I read:

Christian Scott is shocked when his wife, Lily, tells him she defended herself from an attacker in the local park. It wasn’t a stranger, but Jake Hayes, the husband of her friend and coworker Nina, so she decided not to report the encounter.

Nina Hayes is frustrated, but not surprised, when Jake doesn’t come home that night. After all, they had had a fight the night before and their marriage had been strained. As one night becomes several, her worries escalate, a concern she shares with Lily and the police.

Lily and Christian panic. What if Lily, in defending herself, hurt Jake. Worse, what if he is dead? Would anyone believe her story after so much time had passed? In their fear, they hide any evidence of the encounter, hoping to deflect any police attention away from Lily.

Layer by layer, the lies and deceit the two couples share are uncovered.