William's little sister, Mary, has lots of annoying habits, but the worst is her invention of an imaginary friend. Not just any old imaginary friend, but a lamb. Now Lamb is stealing William's place on the sofa and eating all his favourite tea-time biscuits. The rest of William's family think Mary's adorable, and humour her, but William is irritated. Now he's invented some imaginary friends. Only there are six of them. And they're wolves. It looks like Lamb could be in for a shock ...
Used availability for Kathryn Cave's William and the Wolves
March 1991 : USA Hardback
May 1999 : UK Paperback
September 1992 : UK Paperback