Mr Majeika and the Haunted Hotel, Paperback/Humphrey Carpenter

'Oh, don't be cowards,' said Jody. 'I'm sure it's perfectly safe.' Mysteriously stranded in the fog at night, Mr. Majeika and Class Three find themselves in a creepy hotel near Hadrian's Wall, where some very spooky things start to happen. Strange lights, ghostly sounds and vanishing people...