Hercule Poirot is called in to investigate a case for an insurance company regarding firstly a dead woman's body found on a moor and then a important diamond sent to the company to be insured turns out to be a fake. Poirot discovers that the diamond was bought for Arlena Marshall by Sir Horace Platt and Arlena is on her honeymoon with her husband and step-daughter on a tropical island hotel. He joins them on the island and finds that everybody else starts to hate Arlena for different reasons - refusing to do a stage show, stopping a book, and for having an open affair with Patrick Redfern, another guest, in full view of his shy wife. So it's only a matter of time before Arlena turns up dead, strangled and Poirot must find out who it is...

Colditz castle was used by the Nazis to hold the "bad boys", (those who regularly tried to escape from other camps). At all times the guards outnumbered the prisoners and, because some political prisoners were also held there they were *very* strictly monitored. But if you put all those people in one place and they're all trying to escape, well ...

Mallory and Miller are back. It seems that there was traitor with them at Navarone, whom they thought was executed. But it seems that not only was he not executed, and he was not a traitor but a German spy. Intelligence believes he made it to Yugoslavia and is now with the Partisans. So, Mallory and Miller being the only ones who can positively identify him are sent along with a unit called Force 10, which is led by Colonel Barnsby, who objects to their presence. It seems that Force 10 has a mission of their own which Mallory and Miller know nothing about. When their plane is shot and most of the team is killed, they mistakenly believe that some of the locals they meet are Partisans but in reality are German Allies, so they are taken prisoner, and have to convince the German commander that they are not spies or else they will be killed.