“Stillwater” (**1/2 out of four) was a mildly moving story of a dedicated blue-collar father (Matt Damon) who travels from Oklahoma to France to help his estranged daughter (Abigail Breslin) who is in prison for a murder she says she didn’t commit and attempts to prove her innocence and get her out of prison at any personal cost. Starts off absorbing and gripping but then goes flat, as it wanders in too many different directions as Damon falls in love with a Frenchwoman (Camille Cottin) and gets mired up in the criminal underworld. Even the ending doesn’t quite have the visceral impact or punch it needs but Damon’s heartfelt and solid work makes film overall worth watching.