2x21 - Beauty and the Beast

In the aftermath of Spirko's death, Burch and Catherine set out to find the man who hired his killer—unaware the killer is Paracelsus, who fatally stabbed Spirko, setting in motion the next stage of his plan to take over 'The World Below'. Disguised as Father—whom he left bound and hidden in a rented penthouse—Paracelsus lies to Vincent about his birth, which brings Vincent to the verge of madness in a final confrontation.