Trouble by Cheryl Ann Smith

Goons, deadbeats, and murder: A tenacious process server's unconventional techniques get her into loads of trouble. So much so that her boss jokes that he keeps the coroner on speed dial just in case. Still, most of Andie Dixon's job is pretty tame if she doesn't count snapping dogs and homeowners squirting her with garden hoses.
That changes when she serves papers on a notorious crime boss and puts her life in real jeopardy. But despite this close call, Andie will not let threats keep her from doing her job. She puts the matter behind her until a hunky U.S. Marshal tracks her down and solicits her help to find the fugitive. Again. At first Andie adamantly refuses, but eventually agrees when she's swayed by the Marshal's persistence and rather dreamy brown eyes. However, when crime boss Sammy Gilroy, finds out she's back and close on his heels, he threatens to make her disappear for good this time.
Marshall Colin Navarro needs to find Sammy Gilroy before the man vanishes forever. Colin is certain that the notorious crime leader was involved in a shoot-out with the FBI that injured his sister. But he never expected that he'd have to sway a newbie process-server to help, or that she'd turn out to be stubborn, aggravating, and an all-around pain in the ass. Yet despite her shortcomings, he cannot figure out why she's taken over his thoughts and is front and center in some very hot fantasies. But can he keep her from getting herself killed as they edge closer to catching the fugitive? Then again, the crime boss and his goons don't know who they're messing with.
With Andie on the case, Colin is beginning to believe that justice may be served after all.