Young Imogen Burnhope and her maid Rhoda board a non-stop train to
Oxford to visit her Aunt Cassandra, who waits on the platform at Oxford
station where the train terminates, to greet them. Only they never
arrive. All the passengers alight but the two women are nowhere to be
seen. The train is searched and the coachman swears he saw them board
onto first class, but they seem to have vanished into thin air. The
Railway Detective must unravel the mystifying web of their disappearance
before Imogen and Rhoda vanish into oblivion for good.