The great detective Banana Fox is called back to duty to find a missing turtle. But the deeper he digs, the more he discovers, and it's worse than he thought! The Secret Sour Society is back, and they're mixing up a bunch of trouble. Can Banana Fox and his sidekick, Flashlight, put an end to the Secret Sour Society once and for all?

"In this all-new very special mini-series, the Aldens have been recruited by a secret society to return lost artifacts and treasures to their rightful locations--all around the world! The Aldens arrive in Egypt but the agent they're supposed to meet has gone missing! With the help of a puzzle in a papyrus scroll, they figure out their next mission--to deliver a tiny ancient pharaoh statue to an archaelogist at the Pyramids! Along the way they outwit...

"Twins Ethan and Ella go on an adventure in Greece, where they learn about the mystery-solving Society of Apollo"--

After finding a statue in an old trunk, the children travel across the country with the statue and six mysterious boxes an in attempt to make sure the treasures all stay where they belong.

Following clues provided by the secretive Reddimus Society, the four Alden siblings travel to a dingo sanctuary in Australia and to Shackleton's hut in Antarctica to deliver the fifth and sixth artifacts, and then they work to unmask the traitor traveling with them.