Not quite Agatha Christie, when Rumpole and 'She who must be obeyed' take a second honeymoon on a cruise, his arch judicial opponent - or one of them - from the Bailey, Mr Justice Graves (funnily enough portrayed by a real Bailey, Robin) happens to be on the same cruise.
Both try avoiding each other in a suitably impish cat and mouse sequence, but when they ultimately - and inevitably - meet, they both get intrigued by an insurance salesman-cum-vicar whose wife, Mavis Britwell, is perennially ill and then disappears.
A detective writer, Howard Swainton, gets in on the act with various arch criminal theories about what has become of her before the somewhat rushed denouement, when Rumpole explains all.
Not quite Murder on the Orient Express, but good to see Horace has decent sea legs and a good memory, both essential for the plot. The talented ensemble play the various roles with a light touch, how much we miss wit on contemporary television having to make do with incessant cookery programs, when we can neither taste, nor judge the outcome.
This we can taste; succulent, tongue in cheek, witty and erudite - with a sad tale of a lobster consumed on the Rumpoles first honeymoon, a lesson for us all. Avoid rich food, if you want to properly enjoy the nuptials rather than recall them as a deep pain in the pit of your stomach.