S.W.I.T.C.H.: Spider Stampede

In "S.W.I.T.C.H.: Spider Stampede," twins Josh and Danny undergo a dramatic transformation when their next-door neighbor Petty Potts, a peculiar scientist, exposes them to an experimental serum that turns them into spiders with eight legs and the ability to shoot webbing from their bodies. The brothers must navigate their backyard while in spider form and figure out how to reverse the effects before the day is over. This is the first book in the S.W.I.T.C.H. series.