Evanovich, Janet. Motor Mouth. New York: HarperCollins, 2006.
There are bad guys, and then there are really bad guys. Barney and Hooker (aka the good guys) are hot on the trail of their missing friend Gobbles when they accidentally (sort of) steal an eighteen wheeler, find a dead body, and find themselves being chased by the really bad guys.
Motor Mouth is a fast paced read offering lots of laughs, just the right amount of mystery, and quirky characters that keep the plot rolling.