Sequel to The Hybrid Keeping his vow to the Doctor, Caelius has decided to stay on Earth with Missy as acting guardians of Time Lord-Human hybrid Wilhelmina Amie Rose until the Doctor can return for his daughter himself. But three years later, when their contract is set to expire, the Doctor still hasn't showed. Concerned for her safety but weary of the danger they will put her in the longer they stay, Missy and Caelius leave Wilhelmina on Earth, placing her into a lacking local foster care system where she remains until adulthood. Years later, Wilhelmina, now going by Bill, while working as a dining lady at St. Luke's catches the eye of a certain Time Lord, setting the two strangers off on a fresh set of heartache, revelations and adventures.