I am a movie director and I just received the following movie plot. Could you help me answer this question? If not, let me know by writing "Not answerable". Plot title: Bandidas Movie plot: Set in Mexico during the 1850s, the film tells the story of Sara Sandoval (Salma Hayek) and Maria Alvarez (Penelope Cruz). Maria is an uneducated, poor farm-girl whose caring father is being forced off his land by a cruel U.S. land baron, named Tyler Jackson (Dwight Yoakam). Sara is the highly educated, wealthy daughter of the arrogant owner of the nearby properties, and has recently returned from Europe where she attended numerous grade schools and colleges in England, Spain, and France for several years. In one fell swoop, both Maria's and Sara's fathers fall under attack by the baron, (Sara's father is killed, Maria's is shot but survives) giving him free rein in the nearby territories. As an act of revenge, Maria and Sara team up to become bank robbers, stealing and giving back to the poor Mexicans who had lost their lands. At first, the two are catty and quick to fight over the smallest matters over their different backgrounds, but under the tutelage of famed bank robber Bill Buck they learn to trust each other. During a training session, the two women are testing their strength by hanging off a cliff over a wide river, and at the last moment Maria swallows her pride and tells Sara she can't swim. Maria nearly drowns but is saved by Sara, and it is then that the two women put aside their differences and agree that, while they are not friends yet, they can at least work together as partners. Maria turns out to be a crack shot and, while Sara can barely hold a gun, she shows that she is an expert with throwing knives. Angered by the recent attacks by the newly infamous 'Bandidas', Jackson brings in a specialist criminal investigator named Quentin Cooke. It doesn't take long for Sara and Maria to hear of this, and they quickly capture Cooke and seduce him to help them. He has already figured out that Sara's father was murdered and therefore discovers that his employer is actually a criminal. Now there are three robbers, each playing their part in bigger, more ambitious heists. As time goes on,... My question: who is bank robber?
Bill Buck