Book excerpt: Summer camp was going great for Josh and Danny until mad scientist Petty Potts showed up. Sure, her serum turned them into frogs to help them save their new friend Charlie. But the serum didn't completely wear off: all three kids still have frog feet! They are running out of time to find right antidote before their parents show up. Their best option is to ask Petty to use her S.W.I.T.C.H. formula again. But of course, things don't turn out quite as planned. Do two frogs and a newt stand any chance in a world of hedgehogs, dogs, and poisonous snakes? Josh, Danny, and Charlie are about to find out.