Horst Vanderhoff is an agent-but far from a wheeling-and-dealing Hollywood type. He's the go-between for a highly sought after hit woman known only as Lola negotiating her contracts, collecting her fees, managing communications between her and her customers, etc. While trying to get her next job lined up, Horst is grabbed by the Feds. Naturally, he uses his negotiating skills (the only ones he seems to have) to broker himself a deal: he'll give up Lola's identity in exchange for a chance at joining the Witness Protection Program.
When Mary and Marshall show up at Perryville Prison to pick him up, they find a sarcastic, opinionated complainer who manages to insult them within the first five seconds. No gratitude here. To make matters worse, he has every chronic malady and allergy known to man, including Diabetes. Great: so now Mary's a doctor on top of being a chauffer for this colossal pain in the butt.
Mary isn't in the greatest mood to begin with since she discovered a letter offering Marshall at job at Pinkerton Security. She didn't even know he was looking for a new post. When was he going to tell her? After he stopped showing up for work? When she broaches the topic, he has the nerve to act like the injured party in all of this. She may have read his personal mail but he went behind her back to interview for another job without mentioning it to her. In her humble opinion, she's got the bigger beef.
This four-hour ride across the desert is sure going to be fun: Mary and Marshall in a fight and the most annoying man on the planet in their car heckling them. But when two killers ambush them, disable their car and wound Marshall, Mary suddenly has bigger fish to fry as she must single-handedly keep all of them safe from the ruthless Lola.