This Time It's Sirius

Max can turn into a huge monster just by BURPING, and back again when he SNEEZES. Now Max and his best friend Peregrine realise that a dangerous pack of werewolves from Max's home country of Krit are closing in on him and his family. But Max hasn't told anyone about Sirius the tiny werewolf cub he found, smuggled home, and decided to keep...