Agatha Christie fans will

Rating: 2/10 (15 October 2004)

Spoiler
Starts sadly with a key disappearing down a plug hole, and a man nearly drowning arising spluttering in the dark. The key idea follows it into the sewer.
And are there no good people in this world who won't kill someone else because their own life is threatened?
How did he get into the bath? Why didn't the doctor hear him being lugged across the room? And why not check the dead body - don't they watch any 'who dunnits'? Have read reviews - the idea that it's a spoof seems the kindest.
Agatha Christie fans will get it in the first moments.