A new 6-part crime drama starring Yellowstone's Kelly Reilly has been unveiled, with some outlets describing it as "gripping" and "unmissable". The series, titled Under Salt Marsh, also features actor Rafe Spall and has reportedly drawn a significant number of viewers. However, it is unclear if this series is a spin-off of Yellowstone or a separate project, with some outlets suggesting a connection to the show and others not.