'The Lion's Mouse' is a romance-adventure novel written by A. M. Williamson and C. N. Williamson. The story follows a man named Roger Sands, a man with a reputation for being hard as nails, who encounters a beautiful woman who enters his stateroom on a train and claims to be in danger from a man on the train. She begs Sands to keep her in his stateroom, with the door locked, until the train reaches Chicago. Sands agrees, but insists that she pretend to be his cousin rather than his wife. The woman, who remains silent about the nature of the danger she is in, agrees to the arrangement.
