Sarah Jarad has a slightly different life focus. Halfway through a twin pregnancy, Sarah is convinced that she is losing her mind. She can't shake the feeling that she's being watched. She'd like to blame her paranoia on raging hormones, but that doesn't ring true. Sarah fears that her control freak ex-fiancée Mason has finally tracked her down, and that Mason is on Nantucket, plotting revenge.
As John pursues the Baby Alice investigation, myriad family scandals emerge from the Spenser's privileged and gilded past. Events flare white-hot when a copycat criminal snatches a second child. John and Sarah must race against the clock to unmask the kidnapper and expose these modern day threats.