After discovering an ancestral connection to a famous pirate, teenage friends Tara and Diane become even more excited when they stumble across a hidden map that points them to the location of the pirate’s long-lost treasure. Tara’s grandfather has built a secret time portal, codenamed Archie, and the girls decide to use it to go on the adventure of a lifetime. Unfortunately, during their Caribbean island search for the buried treasure, the young adventurers find more than lost treasure; they also find much more trouble than they bargained for! When Tara’s older brother discovers where they’ve gone, he and his friend are worried for their safety and decide to go after them. But little do they know, as they roam the island searching for the treasure hunters, that time is quickly running out for the girls...