In which Lady Constantine mournfully adjusts to Swithin’s departure, reflecting on the dismantling of their shared observatory and encountering a haunting vision in the woods, while a letter from Bishop Helmsdale stirs quiet hope amid her melancholy. Suddenly discovering an unexpected change in her own condition, she resolves with urgent determination to pursue Swithin before he sails, despite her brother Louis’s discouragement and a lost note that might have given her the necessary details.