Brackenreid is missing from the station, so worried Crabtree wants to go search for him, but Murdoch forbids it, feeling Sir doesn't want to be found. John however takes time off to track down his father, who responded to a cry for help from an ex from before his marriage, Sarah Johnston in small town St. Marys, whose daughter Nomi is missing and only now revealed to be biologically Thomas's. After initial refusal to believe it and stating it's the local police jurisdiction, he picks up the trail of the secretarial school student who declined escort work in favor of laundry chores, yet was also 'approached' in that job by a wealthy doctor. Thomas is beaten up, which only stirs his tenacity, and after John finds him, Sarah's home is hit by a fire projectile. Father and ever-loyal son team up to save the half-blood bastard, but back home Margaret Brackenreid can't cope with his 'hidden past'.
—KGF Vissers