Swanson's third thriller, after The Girl with a Clock for a Heart (2014) and The Kind Worth Killing (2015), nods both to the Leopold & Loeb case and to Patricia Highsmith's Tom Ripley, offering twists and intensity aplenty.
A young Englishwoman named Kate, mending after a horrific trauma—her jealous ex stalked her, locked her in a closet, and killed himself just outside it—decides a change of scenery might help restore her, and she agrees to a six-month apartment switch with Corbin, an American cousin she's never met. If she's looking to tamp down her paranoia and learn to trust again, though, her cousin's ultra-luxe Boston apartment is a disastrous choice. As soon as she arrives, Kate discovers there's been a grisly murder next door. A series of small discoveries in the borrowed apartment, a little police attention/skepticism, and a couple of "chance" conversations with neighbors and acquaintances of the victim lead her increasingly to the conclusion that Corbin was romantically involved with the young woman and is the prime suspect. Swanson is most persuasive when we're with the vulnerable but resourceful Kate, who ends up carrying on an ever more dangerous shadow investigation, and with her unlikely romantic interest, an awkward, somewhat creepy (the "somewhat" makes him a rarity—and a catch—in this fictive world), but well-meaning neighbor named Alan. The book flounders a bit when Swanson enters Highsmith territory, attempting to inhabit the minds of sociopathic killers, but he does complicate things interestingly and engineers a tense and intricate finale.
A solid and quick-paced thriller—but one that seems to feature a pop-up psychopath behind every door and under every bed.