Hercule Poirot finds himself trying to solve the mystery of the Cloade family. Rosaleen is the young widow of Gordon Cloade who was killed in a gas explosion in his London home. Rosaleen has inherited her late husband's substantial fortune and she and her brother David Hunter are refusing to share it with other members of Gordon Cloade's family. There have been persistent rumors that Rosaleen's first husband, an intrepid explorer, is still alive and as such would nullify her marriage to Gordon. What Poirot learns however is of a far greater deception that will alter everyone's perception of what they believe to their reality.

Around 30% of the land's surface is desert, the most varied of our ecosystems despite the lack of rain. Unravel the secrets of desert survival and experience the ephemeral nature of this dynamic environment. Watch Saharan sandstorms nearly a mile high and desert rivers that run for a single day.In the Gobi Desert, rare Bactrian camels get moisture from the snow. In the Atacama, guanacos survive by licking dew off cactus spines. In the USA, the brief blooming of Death Valley triggers a plague of locusts 65km wide and 160km long. A unique aerial voyage over the Namibian desert reveals elephants on a long trek for food and desert lions searching for wandering oryx.

Malcolm joins a local dance class to impress a girl, but when she loses her footing, he realizes that to win the competition he'll need a partner who can step it up. Dick, a rival student in the class who takes dancing a bit too seriously, challenges Malcolm to a dance-off. Meanwhile, Hal discovers an underground bachelor pad in the backyard.