John Tanner is an undercover FBI agent, working together with SAPD in order to take down a vehicle theft ring, the most notorious vehicle theft gang in San Andreas, called De Santos
John manages to infiltrate De Santos. He maintains contact with his partner Jones, and their plan is simple - get the information where the cars are shipped, bust De Santos and put them behind the bars.
However.. It was never that easy.. Tanner will first have to proove to De Santos that he's a reliable driver they can trust.