The show revolves around polar opposite brothers Rick and A.J. Simon. Rick was a United States Marine Corps Vietnam veteran and had much more street sense, while A.J. went to college and had book smarts. Rick preferred things that were viewed by his brother as lower-class, while A.J. took care of his money and could afford to be more fashionable. A.J. was a practicing Catholic, while Rick was not. Rick lived on a boat in A.J.'s yard. A.J. preferred to first try to do things by the rules while Rick was much more of a free spirit.
The two went into business together, running a private detective service; the contrasting ways that the brothers went about their investigations and the subsequent conflicts between them provided much of the story each week, in addition to the plots of solving the cases.