The Guest (4x60) is an addictive, fast-paced story that centres on the toxic and beguiling relationship between a successful business owner, Fran, and her employee, Ria.Ria has never had the time or opportunity to think about what she might actually want from the world. So, when she starts cleaning for Fran, she’s intoxicated by this confident and self-assured woman who encourages her to take control of her life and, when Ria flourishes, an intense friendship is forged.However, when Fran’s advice leads to a shocking event, the lives of these two very different women become intertwined by shared secrets and dangerous plots. What follows is a compelling and manipulative game of cat-and-mouse. But just who is playing who?