Trying to recover from a recent case, Detective Cassie Maddox is transferred out of the murder squad and starts a relationship with Sam O'Neill. When Sam calls her to the scene of a new case, they find a young woman stabbed to death in a small town outside Dublin. The dead girl's ID says Lexie Madison, the identity Cassie used years ago undercover, and she looks like Cassie.

In the aftermath of a brutal attack that left a woman in intensive care and her husband and young children dead, brash cop Scorcher Kennedy and his rookie partner, Richie, struggle with perplexing clues and Scorcher's haunting memories of a shattering incident from his childhood.

"Being on the Murder Squad is nothing like Detective Antoinette Conway dreamed it would be. Her partner, Stephen Moran, is the only person who seems glad she's there. The rest of her working life is a stream of thankless cases, vicious pranks, and harassment. Antoinette is savagely tough, but she's getting close to the breaking point. Their new case looks like yet another by-the-numbers lovers' quarrel gone bad. Aislinn Murray is blond, pretty, groomed...