Grotlyn

A stunning tale of mystery and suspense, from the best-selling author of The Storm Whale and Grandad's Island, read by Peter Capaldi.   I know when the Grotlyn's been Slipping through your house unseen...   What is the mysterious Grotlyn? What sort of creature could it be, scuttling across the town, frightening everyone in its path? And why has it stolen PC Vickers' knickers?