As the Christmas holidays wind down, Mandie is shocked to learn a turkey has been stolen from Aunt Lou's oven. While searching for the missing bird, Mandie and her friends uncover another mystery--and then another, and another. And when Dr. Woodard disappears, things get very serious...and dangerous!

It's spring break, and Mandie is eager to visit the Woodards, especially her friend Joe. Almost as soon as they reunite, they discover a large pile of mica in an unexpected place. It's an even bigger mystery when the entire mound disappears the next day. Who would have done such a thing, and why?

Mandie, Celia, and Mrs. Taft make a trip to visit Senator Morton in Florida, where Mandie finds plenty of mysteries to investigate, including grown-ups who believe in ghosts, a man who can't hear or speak, and the suprising reappearance of that strange woman who followed them all over Europe!