State of the Onion (Berkley Prime Crime Mysteries)
The highly trained Secret Service agents couldn't do it. The snipers swarming the White House grounds were no help. Only Ollie Paras was able to stop the intruder hitting him with a frying pan. She'd like to wash her hands of the whole thing, but after she witness a murder, there's no going back. Ollie's Secret Service boyfriend warns her that the killer is a world class assassin. And Ollie's the only person alive who can recognize him. Still, guilt propels her to investigate even if it means putting herself and her relationship in hot water.