Midnight Riders (S03E13)

Micki, Johnny, and Jack are enjoying a break while stargazing in Jack's childhood town. Suddenly, a spectral biker gang known as the Midnight Riders arrives, and at the same time, Jack's long-missing father, Cawley, returns after ten years. The gang seeks vengeance for being wrongfully accused of a crime by a girl who lied to save her reputation and explain her pregnancy. Cawley was involved in the gang's murder and concealed the truth. It’s revealed that he’s also a ghost, having perished at sea, returning on the anniversary of the gang's demise. As the girl and others involved in the killings meet their fate, Cawley shares a fleeting moment with Jack before vanishing once more.