Starsky and Hutch are involved in safeguarding a big time crime boss who has agreed to testify before a Senate sub-committee against some leading underworld figures. But when during escort of the crime boss, the party is ambushed and the man shot and hospitalised, and refuses to go ahead with the testimony unless his daughter is brought safely to him. So Starsky and Hutch are assigned to bring the man's daughter safely to him, but the trip is a dangerous one, as they are chased the whole way across state by ruthless hit-men out to see that they never make it, and thus the trial never going ahead. Further more, the daring detectives aren't even aware of the full state of affairs regarding the case...