Never Say Never

From the introduction: The protagonists are tasked with recovering Betty Sunderland’s diaries, stolen from her little shop in Chelsea. The thief apparently wanted to use them to discover what happened to Colonel Neville ‘Never’ Goodenough many years before, when he went missing on the Orient Express. Yet things are not as they appear; the cult of the Skinless One may have resurfaced to threaten the world once again!