Bridget Regan, Shawn Ashmore and Amanda Schull in "Devil's Gate" (Credit: Tribeca Film Festival) Shawn Ashmore is the comic relief in writer-director Clay Staub’s taut, atmospheric new thriller, “Devil’s Gate.” In the film, Ashmore’s character, Colt Slater, is a deputy in the title town who helps incoming FBI special agent Daria Francis (Amanda Schull) investigate the disappearance of Jackson Pritchard’s (Milo Ventimiglia) wife and son.