A stunning tale of mystery and suspense, from the best-selling author of The Storm Whale and Grandad's Island, read by Peter Capaldi.Β Β I know when the Grotlyn's been Slipping through your house unseen...Β Β 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?
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