In this chase through history, twins, Abigail and Jackie, discover an old, blue sapphire in a mysterious antique shop owned by the conniving Wescott. Legend has it that whoever finds all five sapphires and places them together will control time. When the twins are accidentally transported back in time, they must find the remaining sapphires, so they can return to the present. They tangle with pirates in the 1700’s, start the gold rush of the 1800’s, run across the Loch Ness Monster in the 1930’s and eventually drag their growing entourage into the Disco Era of the late ‘70’s… all the while staying a step ahead of their nemesis, Wescott. History class has never been so exciting!