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The team investigates an apparent suicide at a hotel, and call in DI Neville Parker. More

As the team investigate an apparent suicide at a hotel, they are forced to call in DI Neville Parker, a detective who suffers from several serious allergies, only for Parker to determine that the 'suicide' is actually a murder, despite the fact that there is no way for the killer to have left the room as both the room door and bathroom door were locked from the inside.

AIR DATE 5/3/20