After forensic technician Kelly Mahon is stabbed to death her colleague Lucy Kennard is also attacked,claiming the assailant was taxi driver Carl Lucas who,it would seem,also killed Kelly. Lucy is nervous and seeks reassurance from Sam,eventually having a sexual relationship with him. However mounting evidence suggests that Lucy is the murderer who deliberately incriminated Carl. Furthermore she has a history of extorting money from men,including Kelly's boyfriend Tom. She is tried for murder but in court drops a bombshell that throws her sanity in doubt,claiming that the judge agreed to acquit her if she had sex with him.
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