Malorie Blackman's hilarious tale of shape-shifting and babysitting antics - now in a standard paperback format for middle-grade readers.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!

Malorie Blackman was the eighth Children's Laureate and is one of the UK's most popular children's authors. She has won, amongst a raft of other prizes, the Children's Book Award and is the force behind YALC. In 2005 she was honoured with the Eleanor Farjeon Award and in 2008 she received an OBE for services to children's literature. She has been described by The Times as 'a national treasure'. She lives in Kent.