How far would you go to save your annoying big bug sister?

When Jenny accidentally uses Petty Potts's S.W.I.T.C.H spray on herself, Josh and Danny know that there is only one thing for it.

They'll have to change themselves into crane flies to save their sister.

However risky . . .

Josh and Danny must go on a rescue mission to save their annoying big sister, Jenny, when she accidentally uses the S.W.I.T.C.H spray on herself and turns into a crane fly!

The twins know there's only one thing for it - they'll have to change themselves into crane flies too, and try to keep their sister out of trouble.

However risky . . .

Can the boys resist the lure of the light bulb and stop Jenny from getting legless? And will Piddle the dog be able to resist a crunchy, bugtastic snack?

Petty Potts's diary entry:

Victor Crouch's spies could be anywhere! I keep imagining that old eyebrow-less freak staring through my windows . . .

But I suppose I do have to remember that sometimes I see and hear things which aren't really there. That's all part of the package when you're a genius. I will make sure Josh and Danny keep very watchful, though.

Ah ha! Ah ha ha ha ha! Erm. Scary powerful laugh etc. (It doesn't really work, typed out, does it?)

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!