Henry, Jessie, Violet, and Benny become trapped in a cabin by an unexpected snowstorm, which turns into an even greater adventure when they help their neighbors, a baker and his family, recover an old family secret.

Now vacationing with their grandfather in the South Seas, Henry, Jessie, Violet, and Benny are supposed to be on an uninhabited island. But they soon suspect someone else is there too, someone who may not want them around.

The Greenfield Museum is holding a special exhibit all about ancient Egypt, and the main attraction is a 4,000-year-old mummy! But ever since the mummy arrived, nothing's gone right for the museum or its workers. Could the spooky sarcophagus be behind all the bad luck?

The Aldens have joined Dr. Iris Perez as she investigates legendary creatures around the world. In this adventure, the children investigate what might be living in the deep trench off the coast of Puerto Rico. From manatees to mermaids to sea monsters, creatures of the sea have been attracting tourists to the area for years. But when a man on a nearby island goes missing, it's up to the Aldens to sort out fact from fiction.

The Aldens head to Ladakh, a territory in northern India, to help save the elusive and critically endangered snow leopard.

At the same time that the Alden children's efforts to raise money for a new hospital wing are being sabotaged by nasty tricks, they find their attempts to befriend the new girl, Beth, frustrated by her strange behavior.