Ducking and Diving
When an armoured security van is discovered at the bottom of a lake, the team makes a link with the murder of a woman 17 years previously. The husband of the deceased, who owned the company which the van belonged to, seems to be the prime suspect but when he is provided with an alibi, Sandra decides to dive down to examine the vehicle herself and uncovers the murder weapon. However, the killer is about to strike again.
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