When Officer Alan Edwards and K-9 Officer Craig Hamilton of the Spokane, WA, Police Department respond to a call regarding a male who has been eluding police and burglarizing homes, the suspect is initially found hiding on the roof of a dwelling. When the suspect scrambles around, there is a short negotiation after officers announce they have a police dog.

Another segment features Officers Michael Joiner and Kevin Trussell of the Chattanooga, TN, Police Department as they respond to a call from a woman who wants to know if her husband is manufacturing meth in their home.

His friend, solicitor Gilbert Entwhistle, asks Hercule Poirot to help solve a riddle and a murder. The riddle has to do with Richard Abernethie's will. It would seem that he changed his will immediately prior to his death, distributing all of his wealth equally among family members but excluding George Abernethie who, in all previous wills, had been the sole beneficiary. The two had supposedly argued recently, but Entwhistle suspects the new will may be a forgery. As for the murder, he would like Poirot to investigate the death of Cora Galaccio, who was violently beaten to death the day after Richard's funeral. She too had inherited from the suspect will, but are the two deaths and the will all part of a greater plot, or is there a simpler explanation?

The Cave of Swallows in Mexico is a 400m vertical shaft, deep enough to engulf the Empire State Building. The Lechuguilla cave system in the USA is 193km long and 500m deep with astonishing crystal formations hanging from its chambers. Although often overlooked, caves are remarkable habitats with equally bizarre wildlife. Cave angel fish cling to the walls behind cave waterfalls with microscopic hooks on their flattened fins. Cave swiftlets navigate by echo-location and build nests out of saliva. The Texas cave salamander has neither eyes nor pigment. Unique access to a hidden world of stalactites, stalagmites, snotites and troglodytes brings a wealth of surprises.