After leaving Lauren so she can get used to normal life again, the Doctor returns to take her on a magical trip that turns into a nightmare when they get stranded on the Titanic, with a limited amount of time to possibly save the ship, or let it sink and only save themselves Book #4

After the return of our favorite heroes, their future is cloudy. But as they travel to Victorian London, they soon discover a dark force at work Book #3

Book 2 in my Series of Doctor Who and Cimorelli