When Eliza Anderson hires the Portobello Detective Agency to find her missing sister, Grace McKenna’s investigation leads her to Whiteadder House, a clinic with a too-good-to-be-true facade. As Grace and her team uncover corruption protecting the clinic, they find themselves without police support. The discovery of a body linked to the clinic escalates the situation, forcing Grace to risk everything to infiltrate Whiteadder House and save the missing sister.