Return To Purgatory - The Nether Series

A lot has changed for Ripley over the last ten years, but the one constant has always been Scott. Not only did the Cooke's welcome her with opened arms after the divorce, but they helped her get into college and on the fast track to working in the literary field.  After fighting for every scrap of happiness she could get a hand on, everything finally felt like it was coming together. Until she got the text from Scott.
The door is open. Katie's missing.  Now, it's a race against time. They must rescue Katie before Clara can get her claws into her. But with dead-eyed doctors and crazed nurses, that's going to be easier said than done.  How are they going to get away from Dawn Valley Sanatorium this time?