Robert McCall is a former agent of a secret government agency who is now running his own private crime fighting operation where he fashions himself as "The Equalizer." It is a service for victims of the system who have exhausted all possible means of seeking justice and have nowhere to go. McCall promises to even out the odds for them.

Brewster, an aging minor-league baseball player, stands to inherit 300 million dollars if he can successfully spend 30 million dollars in 30 days without anything to show for it, and without telling anyone what he's up to... A task that's a lot harder than it sounds!