Nancy North is ready to put her life back together. After suffering a psychotic break that ruined friendships, stalled her fledgling restaurant, and forced her to move out of her comfortable flat, she'll do anything to get back to normal. She and her partner Felix -- who has been a saint through her recent troubles -- move into a new flat for a fresh start. Nancy is taking her pills, seeing her therapist, and avoiding unnecessary stress. She's doing absolutely everything right, but something is still very, very wrong. On the first day in the new flat, she hears them again; the mysterious voices that triggered her first episode. It could just be the unfamiliar sounds of water in the pipes, or the screaming baby across the hall, but deep down she knows something more sinister is going on. Her fears are confirmed when the young woman in the downstairs flat, Kira, is found dead. Felix, her neighbors, and even the police insist it's a tragic suicide, but the pieces aren't adding up for Nancy. Can she trust her own instincts, or is it all in her head? Meanwhile, Detective Inspector Maud O'Connor has misgivings about her colleagues' investigation of Kira's death. The boys club at the top seems intent on closing the case as quickly as possible, especially since the only person who thinks it could be anything other than suicide is known to be unreliable. But Maud knows what it's like to be dismissed as an overemotional woman and isn't so quick to discount Nancy's claims. As tensions reach an explosive breaking point, the line between fact and delusion becomes dangerously blurred, but Maud will stop at nothing to ensure that the truth comes to light.