This article contains spoilers for the main case Lost at Sea. Capt. Jeremiah Sanders is the captain of the Titania. Charles Reed meets him when investigating the disappearance of the expedition Throgmorton sent to find the cause of the madness spreading in Oakmont.
He finds him at the hospital of Saint Mary, suffering from an axe shoulder wound inflicted by a sailor from his ship during the mutiny. He had used a fake name, Joseph Willow, upon entering the hospital.