Morphers (sale $1.99)

Sam Garson had a fur ball stuck in his throat. He blamed his best friend, Dan Lin, who had a problem of a different kind – feathers that sprouted from his ankle. Dan, in turn, blamed the book of ‘Extraordinary Science Potions’; a well-kept secret until Dan stumbled upon it and somehow doomed himself and his best friend to morphing. Yes, morphing – Sam into a cat and Dan into a crow – uncontrollably and when least expected. Now the class bully, Jonathan Bell, has got a copy and all the teachers have disappeared from Weatherly Heights School for the Extraordinary. Things are going from bad to worse!