The problem that faced them was this: how could this well-respected Professor and his hotel-waiter companion, two men missing for ten days or so, widely sought throughout the county and beyond, suddenly turn up from nowhere - in this very station? Moreover, they had materialised in one of the ancient, long-disused cell rooms situated in its very centre! These old cells were used as store-rooms nowadays, seldom visited, none of them locked. How had this odd pair managed to pass the main desk i...