Nicole has to make a strange noise each time her mum says a word with a `K' sound, and Trina is tormented by constant violent thoughts. Can cognitive behavioural therapy help?

Nidia obsessively washes herself and has showering ritual that's so extreme there's a chance she could pass out in the middle of it. Can CBT help her gain control of her life?

Russ hoards so much junk in his flat that he sleeps outside. Karen is obsessed with death and fears that she or someone close to her will die. Both hope therapy can cure them.

Todd has a compulsion to pull out his hair and Shannon won't drive for fear she will go blind or spontaneously combust. Can CBT coax them out of their problems?

Traci has germaphobia and claustrophobia. She's always cleaning and won't get in a lift, while Judi is a compulsive hoarder. Will their obsessions dominate their lives forever?