One of the three biggest Sergio Leone westerns with Clint Eastwood, where two competitive bounty hunters (Clint Eastwood & Lee van Cleef) team up against a notorious group of bank robbers, all already wanted by the police.
The plot is all about (the lack of) mutual trust in how to cooperate in their quest and how to split the earnings (following from estimated bounty rewards, if successful).
An incredible display of power play between egos enables an impressive atmosphere, making the movie both enjoyable for the story and all around it.