Book 4, "Ticking: Southumb Pride"
The fourth adventure of chrononauts Skypilot Sewell and Zachary Burling finds them returning to Southumbria, a world that resembles our world in the late 1800’s, with a whirring steampunk vibe. This vibe includes the ticking of clocks, the clicking of gears, the sheen of burnished metal, the softness of velvet and steamy goggles everywhere. This time, Sky's Aunt Beatrice joins them, leaving a nervous Alim in charge in her basement laboratory.
They land in the middle of a civil war, and reconnect with Nelly Lovelock, the captain of a privateer airship and leader of the rebellion. Nelly, mysterious and charismatic, convinces Bea to join her on a trip into the future; the future of Southumbria! Beatrice finds much there; including a part of herself.
They also reconnect with Sam Richter, the spy who decided to remain in Southumbria on their previous trip there. Sam had stayed to be with his new bride, Tabitha Tremaine. Tabitha is expecting their first child. But she is kidnapped as a victim of the war. Sam is desperate to find her.