In this twisty psychological thriller from the New York Times best selling author of The Girl Before; an actress plays both sides of a murder investigation. One out of work British actress pays the rent on her New York City apartment the only way she can, as a decoy for a detective agency, hired to entrap straying husbands. When the cops begin investigating one of her targets for murdering his wife, and potentially others, they ask her to lure the suspect into a confession. With the actress pretending to be someone she isn't, differentiating the decoy from the prey becomes impossible, and deadly.