Celebrating her 45th birthday at her local pub, podcaster Alix meets Josie. Days later, they bump into each other again. Josie has been listening to Alix's podcasts and wants to be a subject for her series. Alix agrees. Slowly, she realises Josie's hidden dark secrets, and before she knows it, she's inveigled her way into Alix's life and home. From the bestselling author "The Family Upstairs".