Molly Moon can hypnotize or morph into anyone she chooses, travel through time, read minds—and now, thanks to a mysterious and magical coin, she can play EVERY instrument. The harmonica! The guitar! The drums! The piano! You name it. But will Molly be able to free herself from the coin's powers to save her friends—and herself? In the fun-filled sixth and final book of the Molly Moon series, Molly must face the music—the hypnotic music—of a magical coin that has the power to turn its owners into monsters!