The team arrive on unexplored planet Bedrosia, where their arrival is soon detected by a group of soldiers who capture members of the squad, believing them to be spies.

The focus of the case returns to a politically influential family and, during the course of the trial, McCoy finds the powerful matriarch to be a formidable opponent.

After a salesman is murdered, the detectives turn their attention to Stephanie Mulroney, the youngest daughter of a well-known family with some deep connections. But as they join forces with the officers from the two-seven, they realize that their case is connected with a long-unsolved case that Briscoe once handled years ago with his former partner, Mike Logan.

Lady Edgware, the well-known stage actress Jane Wilkinson has a dilemma in that her husband has consistently refused to give her a divorce. She asks Hercule Poirot to visit the man and see if there is any possibility of convincing him. Lord Edgware is nothing short of nasty treating all of those around him very badly. When he is found dead, there is no great surprise but there certainly a good number of suspects. The police believe Lady Edgware to be the culprit but she has a cast iron alibi having attended a private dinner over the time her husband was killed. There is also the man's nephew, who would inherit his fortune; his personal assistant, whom he treated very badly; and then there is the family butler who clearly has his own interests at heart.

Penny is out on a scuba diving course only for trouble to ensure underwater as Barney is reunited with an old friend who ends up getting stabbed.