Horst Vanderhoff is an agent, which is difficult enough when you're dealing with actors, but Horst's job is a good deal more stressful. He's the go-between for a highly sought after hit woman known only as Lola. While trying to get her next job lined up, Horst is grabbed by the Feds and forced to give testimony against her in exchange for a chance at joining the Witness Protection Program. When Mary and Marshall show up at Perryville Prison to pick him up, he's justifiably nervous. He's also really irritating. Mary and Marshall set out toward the desert, convinced that the worst part of the job will be putting up with Horst for four hours. But when two killers ambush them, disable their car and wound Marshall, Mary has the much more difficult task of finding a way to keep all of them safe from Lola.