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The team reinvestigates a decades old death at the Natural History Museun. Did senior palentologist Bernard Fletcher die from a fall, or was he murdered? To solve the case, the aging detectives must walk amoung the dinosaurs.
When DNA tests on a suspected robber prove his innocence, they also point to an earlie r crime: the 15 year old murder of an unarmed vagrant on a tube train.The trailleads the team to the victim's posh relatives, and Brian has a run-in with the homeless community.