Explosive Eighteen by Janet Evanovich

Stephanie Plum is returning from Hawaii with an envelope in her bag she didn't have when she left. Now her seatmate is dead, and she is being chased by pseudo-FBI agents, real FBI agents and one scary Razzle Dazzle who is determined to do her in for the picture in the envelope. Only she doesn't have the picture any more. Trying to do her job as bail bondsman, her car is stolen by Big Buggy repeatedly, Lula falls for one of the skips, the temporary headquarters goes up in flames and horror of horrors, Joyce Barnhardt moves into Stephanie's apartment. Joe Morelli and Ranger seem to be eyeing each other warily. Evanovich continues to create chaos for Stephanie Plum, bail bondsman.