Lean Mean Thirteen by Janet Evanovich

Stephanie Plum never thought seeing her ex-husband again would land her in the middle of a murder investigation. When Dickie Orr disappears after a heated confrontation, Stephanie becomes the prime suspect—and soon finds herself tangled in a dangerous web involving millions in stolen money, ruthless killers, and some very unpleasant surprises. With help from the ever-mysterious Ranger and the irresistibly infuriating Joe Morelli, Stephanie races to clear her name before things get deadly. Packed with explosive humor, fast-paced action, and plenty of Jersey attitude, Lean Mean Thirteen is classic Evanovich—sharp, sassy, and wildly entertaining.