Ashes to Ashes
by Tami Hoag
The first book in the Kovac / Liska series. (Liska is the wisecracking one). Although, here, they are not the main characters: it's former FBI agent turned victim/witness Advocate, Kate Conlan and Special Agent John Quinn here battling a mass murderer who first tortures his victims, then anoints them and sets them ablaze.
