Josh and Danny become involved in another of Petty Potts's mad schemes to try out her S.W.I.T.C.H formula. Soon the boys are beetling about in a pond, breathing underwater, and creating the most almighty stench to scare off predators.

But pond life is the least of their problems. A mysterious stranger is hanging around and he's out to get them.

Josh and Danny are on a day out with the local nature group, but when they accidentally eat a chocolate muffin laced with S.W.I.T.C.H formula, they experience the real dangers of pond life first hand. Soon the boys are beetling about in a pond, breathing underwater, and creating the most almighty stench to scare off predators.

But life as a pongy pond beetle is the least of their problems-there's a mysterious stranger hanging around-and he's out to get them.

Will Josh and Danny find out who the stranger is before it's too late? And can they help Petty Potts in her mission to recover all of the REPTOSWITCH cubes so she can turn them into even more exciting beasties?

Petty Potts's diary entry:

I do hope Josh and Danny will come round tomorrow-they have to understand the DANGER we're all in! And of course, I really need their help. I'm sure I will manage to talk them around. After all, they both can't wait to try out being a giant python or an alligator or a monitor lizard.

Praise for Ali Sparkes's Frozen in Time, winner of the Blue Peter Book of the Year Award

'I know now what they mean by a plot that is toe-curlingly good . . . brilliantly inventive and rollicking fantastical adventure'

Frozen in Time shows [Ali's] skill at fusing traditional children's storytelling with modern tales . . . Sparkes's sci-fi conspiracy thrills will keep 21st-century kids transfixed

It was outstanding. It blew me away

Praise for Wishful Thinking:

A delight from start to finish . . . Sparkes' clear, direct style is easy to read . . . Oh, what fun this is!