A terrible thunderstorm awakens little Yann during the night. At first he wants to call his Mama, but then he bravely tries to find out what happens when nature goes wild with the help of Mema's home knit 'Thunderstorm Sweater'. This book with 17 illustrations is a part of a collection of independent magic stories with the same story line: Mema in Germany knits her longing for her grandson Yann in France into different sweaters for him. Every time, Yann puts one of these sweaters on and says a spell that he has to find by himself, he gets involved into exciting adventures. The other stories are available as interactive and animated books on the IMAGICBOOKS Website - http: //imagicbooks.free.fr (in German and French, too).