In mild thriller "The Marsh King's Daughter" Ben Mendelsohn's arrested after holding Caren Pistorius captive in the US wilds, where she had Brooklyn Prince who she & Mendelsohn raised for 12 yrs. Years later Prince (now Daisy Ridley) has a child of her own (via hubbie Garrett Hedlund) who Mendelsohn comes for (or does he?) on escaping prison. Director Neil Burger styles it like "Where The Crawdads Sing" / "Lou" but it's lower quality, thanks mainly to the co-writing duo of debutant Elle Smith & "The Covenant" co-writer Mark L Smith whose script is implausible, hole-filled & short-cutting. Gil Birmingham lends decent support, but this one is only just passable.