Problem at Pollensa Bay

In which Christie gives us eight short stories, comprising two with Hercule Poirot, two with Parker Pyne, two with Harley Quin and two other tales. None of the stories had been published in book form in the UK before. Problem at Pollensa Bay was first published in the UK by Harper Collins in November 1991, and this collection was not published in the US as the stories had all been published in magazines there before. I’ll take them all individually, and, as always, I promise not to reveal whodunit!