Curmudgeonly detective Alex Holmes is teamed with a new partner, Gregory 'Yoyo' Yoyonovich, to catch a car thief. Holmes thinks there is something odd about Yoyo who he discovers is a robot, but decides to keep the knowledge to himself.
When Alex tries to pay for his coffee with a counterfeit 20 he is arrested. Later more 20's turn up in the possession of other cops. They try to find out where they got it from. They discover a place they all went to and discover that the guy who bought works with a known counterfeiter.
Holmes and Yoyo are investigating the bombings of dental offices. Yoyo figures out what all have in common, and when they discover that there no more dentists who share that link, they think that's it. But another dental office is bombed. They try to figure out what the bomber has against them.
While on a stake out, Holmes and Yoyo hear a woman had her purse snatched from her, by a dog. And when there are others, they set a trap using Maxine as the mark but the dog gets away. They eventually get a lead on who the one behind the dog is.
Holmes and Yoyo arrest a known criminal. Later the man's associates hold them captive in exchange for the man's release. And because of an earlier incident Yoyo's power is decreasing and if it continues and if he doesn't get a recharge, he will be useless.
Alex and Yoyo learn of an extortion ring from one of their victims. They follow the money to the man who might be the big man. When he threatens them, they arrest him. They later learn that the man has avoided being convicted because everyone who is suppose to testify against him, disappears or expires. So Yoyo protects Alex by sticking to him like glue.