Twelve-year-old Gavin Baker, son of a warrior, is a born worrier. With
his father serving overseas, Gavin assumes that he's already imagined
the worst that can happen-- until he shakes hands with his best friend
Javi's long-lost grandfather and finds himself trapped in the old
magician's ailing body. Help! As the trickster takes over Gavin's life,
fooling the girl of his dreams and even his own family, Gavin wonders if
the imposter is a better version of Gavin than Gavin himself. He has to
convince Javi that the real Gavin now has hairy knuckles and a love of
Pablo Neruda's poetry. Then the boys can try some tricks of their own.
But will the two friends be able to reverse the old devil's magic? Or
will both of their families get their hearts broken?