Not long afterwards, Carson is shot dead, and Jem is arrested for the crime, his gun having been found at the scene. Esther decides to investigate the matter further and discovers that the wadding for the gun was a piece of paper on which is written Mary's name.
She visits her niece to warn her to save the one she loves, and after she leaves Mary realises that the murderer is not Jem but her father. She is now faced with having to save her lover without giving away her father. With the help of Job Legh (the intelligent grandfather of her blind friend Margaret), Mary travels to Liverpool to find the only person who could provide an alibi for Jem â Will Wilson, Jem's cousin and a sailor, who was with him on the night of the murder. Unfortunately, Will's ship is already departing, so that, after Mary chases after the ship in a small boat, the only thing Will can do is promise to return in the pilot ship and testify the next day.