ABC announced the hit drama Big Sky will return to television on a new night starting on September 21. Details of Season 3 have been kept close to the vest so far, but it’ll bring back detectives Cassie Dewell (Kylie Bunbury) and Jenny Hoyt (Katheryn Winnick) for a new mystery in the backcountry of Montana. The series is based on the books of author C.J. Box, which pit the pair of PIs against a mix of local crimes and dangerous criminal organizations operating in the area. Season 2, which wrapped up in May, saw Dewell and Hoyt investigating a seemingly ordinary car accident that spun off into a wider mystery.