“Gasp inducing. The most perfect thriller you’ll read this year.” —Lisa Jewell

How well do you really know the person you married? A man is recruited to spy on his wife—and finds out that nothing is what it seems—in this thrilling mystery from the author of Reese’s Book Club Pick and New York Times bestseller Wrong Place Wrong Time.

Three weeks after his wedding to Sophie, Matt is kidnapped. Placed in the trunk of a car, he is taken to a brightly lit office. There, he is told by MI5 that his new wife is under surveillance, and that they need his help.

Matt realizes that the top security services know everything about their lives. They want information about an unnamed crime, and believe Sophie knows something. They want Matt, as the person closest to her, to get it for them. But Matt knows Sophie, he loves his wife, and nothing that MI5 are telling him about her makes sense.

He is released and returns home, and that is when Sophie tells him the first lie. And that is also when Matt starts to dig into the past, their marriage, and who Sophie really is.

What follows is a kaleidoscopic account of a marriage with shifting loyalties and buried secrets, alternating between the perspectives of husband and wife.

You thought you knew your spouse.
You thought you knew marriage,
And you thought you knew psychological thrillers… think again.