Grandma Dangerous and the dog of destiny

WARNING: DO NOT GIVE THIS BOOK TO YOUR OWN GRANDMA. SHE MIGHT GET IDEAS... Danger is her middle name! Ollie's dad is missing - but Grandma Dangerous is on the case! She has a hot-air balloon, thirty packets of biscuits and a pooch with magical powers (she says). But as they sail through the skies, Ollie realises they're not just on a rescue mission... Grandma's on the run! "Thrills! Biscuits! This book has it all" Andy Riley, author of King Flashypants