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A five-year-old girl goes missing and the police are called in to search. When her body is found inside a sewage pipe, it becomes a murder investigation, which is headed by Detective Superintendent Walker. They follow a few leads and eventually arrest a suspect, who is then sent to trial.
The prosecution case against Dunn starts to fall apart, but a witness called by the defence sets detectives on a hunt for an item that may have been used in the attack.