Watch Devil's Gate full movie online 123 Movies. Watch Devil's Gate 123movies online for free. Devil's Gate Movies123. Set in the small town of Devil's Gate, North Dakota, the film examines the disappearance of a local woman and her young son. Schull plays an FBI agent who helps the local sheriff search for answers. Partnering with a deputy , they track down the missing woman's husband and find that nothing is as it seems.