Malorie Blackman spins a hilarious tale of shape-shifting and babysitting antics.Mike had no idea that his best friend Alex was a Gris-kwok – someone who can turn into any animal he chooses! But Mike’s naughty little sister Molly is a Gris-kwok too. Alex and Mike are about to take on the worst babysitting job in the world!Particularly suitable for readers aged 7+ with a reading age of 7.