Given the question: Build a movie plot around this: How was the strongbox opened? with a key
The answer is:
Jacob McCandles (John Wayne) is a big man with a bigger reputation. A successful rancher and landowner, his many businesses keep him conveniently away from his home and estranged wife Martha (Maureen O'Hara). He returns to the ranch after receiving devastating news: a gang of kidnappers has his grandson, Little Jake (Ethan Wayne), and is demanding one million dollars for his safe return. He, his horse and faithful Dog arrive at the ranch where Martha presents him with some of his beloved firearms, a mule and strong box to hold the million dollars while the two hatch a secret strategy to get Little Jake back.The local sheriff has convened a possee complete with then state-of-the-art automobiles. Two of Jake's sons, the passionate, gunslinging James (Patrick Wayne) and the motorcycle-riding, sharpshooting Michael (Christopher Mitchum) elect to go with the sheriff's possee. Big Jake decides to set off across the rough terrain on his horse with his Dog at his side, and soon meets up with his Native American friend, Sam Sharpnose (Bruce Cabot), who has brought additional horses and supplies.The possee quickly runs into an ambush by the gang led by the ruthless John Fain (Richard Boone). The gang escapes, and Little Jake's condition is unknown. The possee's automobiles are disabled, and they have suffered casualties. James and Michael, despite the turbulent past they endured with their father, decide to join he and Sam on horseback to find Little Jake. Big Jake sends Michael ahead of the group to see if he can locate the Fain gang. As the group makes camp that night, they are approached by Fain pretending to be just a messenger boy. He asks where Michael is, and is informed that he was killed in the firefight. As they talk, Sam jumps on two of the gang trying to ambush the camp, and apologizes to Jake for only killing one. Fain informs Big Jake to proceed to the next town where they will be met and given further instructions. Michael returns to the camp with the news that Little Jake is alive.Upon arrival in the...