(ABC, 9 p.m., midseason premiere, back-to-back episodes, special time): We last saw the intrepid detectives of Dewell-Hoyt Investigations (Kylie Bunbury and Katheryn Winnick, respectively) back in February, when their first mystery came to an end with the death of one baddie and the flight of another. And while we’re guessing that we haven’t seen the last of Brian Geraghty’s Ronald, it’s time for some new villains to enter stage left. Tonight’s even bigger Big Sky kicks off an hour earlier than usual to accommodate an extra hour of Jenny, Cassie, Jerrie, and the rest of the returning gang. Keep an eye out for Allison Shoemaker’s recap.