<P> Lockhart investigates his suspicions and discovers the transfusion wing of the spa is a front for macabre medical experiments . The water from the local aquifer possesses unique properties . It is very toxic to humans, but has life restoring properties to the eels living in the water . The baron had devised a process to filter the water through the bodies of humans, and distill the water into life giving essence . Volmer uses the patients as filters for this process . This "cure" is ingested by Volmer, Hannah, and others in order to gain vastly lengthened lifespans . Lockhart also realizes that his leg isn't broken, and that he is being forcefully kept by Dr. Volmer . Volmer then subjects Lockhart to nightmarish treatments that warp his mind, until he believes he is insane . Hannah realizes this change and gives Lockhart back his ballerina . The ballerina was given to Lockhart by his mother and helps break him out of his delirium . </P> <P> Around this time, Hannah has her first menstrual cycle . Volmer marries Hannah . During the reception, he leads Hannah to a secret room built in the ruins of the castle, and prepares to rape her . Lockhart confronts Volmer and realizes that Volmer is the baron and Hannah is his daughter, who was the baby thrown in the well . They both had aged very slowly due to the "cure". In the ensuing fight, Volmer's face is revealed to be a mask that hides his hideous burns . Lockhart sets Volmer and the castle on fire, but is overpowered by Volmer . Hannah saves Lockhart by killing Volmer, who then falls into the aquifer and is eaten by the eels . </P> <P> Lockhart and Hannah escape from the spa on a bicycle as fire engulfs the structure . On the road, Lockhart crashes into a car carrying his employers, who have arrived from New York to retrieve him and Pembroke . Lockhart is ordered into the car by the employers, who hope he will return to New York with them . Lockhart instead chooses to ride away with Hannah . </P> <Ul> <Li> Dane DeHaan as Lockhart <Ul> <Li> Douglas Hamilton as 9 - year old Lockhart </Li> </Ul> </Li> <Li> Jason Isaacs as Dr. Heinreich Volmer / Baron von Reichmerl </Li> <Li> Mia Goth as Hannah von Reichmerl </Li> <Li> Ivo Nandi as Enrico </Li> <Li> Adrian Schiller as Deputy Director </Li> <Li> Celia Imrie as Victoria Watkins </Li> <Li> Ashok Mandanna as Ron Nair </Li> <Li> Harry Groener as Roland Pembroke </Li> <Li> Godehard Giese as Prim Technician </Li> <Li> Tomas Norström as Frank Hill </Li> <Li> Magnus Krepper as Pieter The Vet </Li> <Li> Carl Lumbly as Wilson </Li> <Li> Lisa Banes as Hollis </Li> <Li> Tom Flynn as Humphrey </Li> <Li> Johannes Krisch as Caretaker </Li> <Li> Jason Babinsky as Carl </Li> <Li> Angelina Häntsch as Volmer Institute Staff </Li> <Li> Jeff Burrell as Funeral Director </Li> <Li> Annette Lober as Volmer Institute Staff </Li> <Li> Eric Todd as Josh </Li> <Li> Christian Brauer as Technician </Li> <Li> Thomas Richter as Water Trainer </Li> <Li> Chris Huszar as Wedding Guest </Li> <Li> Marko Buzin as Wedding Guest </Li> </Ul>

Who plays lockhart in a cure for wellness