In this twisty psychological thriller from the New York Times and Sunday Times bestselling author of The Girl Before, an actress plays both sides of a murder investigation. One aspiring actress from the UK pays for her acting class in New York the only way she can: as a decoy for a firm of divorce lawyers, hired to entrap straying husbands. When the police begin investigating one of her targets for murdering his wife - and potentially others - they ask her to help lure the suspect into a confession. But with the actress pretending to be someone she's not, differentiating the decoy from the prey becomes impossible - and deadly.