| Hugh O'Conor | Graham Young |
| Antony Sher | Dr. Ernest Zeigler |
| Ruth Sheen | Molly |
| Roger Lloyd Pack | Fred |
| Charlotte Coleman | Winnie |
| Paul Stacey | Dennis |
| Samantha Edmonds | Sue |
Graham Young is a teenage misfit living in suburban London in the 1960s. He hates his stepmother but loves chemistry, and the two impulses unite in a wicked plot to slowly poison her. After she dies, he's found guilty and sent to a psychiatric hospital, where an idealistic doctor thinks he can be cured. Upon release, Graham finds a job, but struggles to fight back his old urges for murder. The film is based on the true story of the ''Teacup Murderer.''
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