If a microwave explodes or there are bubbles all over the bathroom floor, it's bound to have been because of Alfie Braithwaite.

Only Alfie swears that it's all the fault of Dave, the terrible gremlin that lives in his sock drawer.

But one day Dave really does appear and starts to wreak more havoc than even Alfie could have imagined!

Will Alfie catch Dave? And will Alfie's parents ever believe that it really wasn't him?