"CUCKOO by Julia Crouch is the original psychological thriller: a dark, deliciously unsettling drama in the vein of I LET YOU GO, THE COUPLE NEXT DOOR and THE GIRL ON THE TRAIN. 'Brilliant... truly chilling' Sophie Hannah Rose has it all - the gorgeous children, the husband, the beautiful home. But then her best friend Polly comes to stay. Very soon, Rose's cosy world starts to fall apart at the seams - her baby falls dangerously ill, her husband is distracted - is Polly behind it all? It appears that once you invite Polly into your home, it's very difficult to get her out again..."