Brothers Rick and A.J. (short for Andrew Jackson) Simon run a private detective agency in San Diego. Rick is a street-smart, good-old-boy Vietnam vet, while A.J. is a book-smart, by-the-rules type. The two have to balance their head-butting with their completely opposite styles while solving crimes and busting bad guys. The brothers have so little in common that they even use different guns -- Rick carries a .44 Magnum while A.J. uses a .357 Magnum. Rick, who prefers things that his brother deems to be lower class, lives on a boat in A.J.'s yard.