Three deaths, one connection—the anonymous calls all three women reported in the weeks before they died. Detective Tony Marino wants to close this case before another woman disappears. Especially when he meets a fatherless little boy whose mother is being stalked. Single mom Erin O'Malley tells Tony about her anonymous caller's heavy breathing and unnerving silences. And the feeling of being watched—constantly. Now, after years of thinking he had nothing to offer a wife and child, Tony will do anything to protect the family that feels like his own. Because Erin is next on the killer's list.