9780345457950 | 1 edition (Ballantine Books, April 1, 2003), cover price $23.95 | About this edition: While helping local police investigate the death of a young woman, vacationing police officer Brian Phelan follows a series of leads that take him into a shadowy world populated by the last members of an ancient order of vampires.

9780826322265 | Univ of New Mexico Pr, June 1, 2000, cover price $24.95 | About this edition: When expert spelunker Jack Whittaker discovers the footprint of an ancient species of bear in a New Mexico cave, he becomes embroiled in a series of murders in the supposedly secure, man-made caverns of a waste isolation plant.

9780826322272 | Univ of New Mexico Pr, January 1, 2003, cover price $9.95 | About this edition: Set in and around the town of Carlsbad, New Mexico--home to both the Department of Energy's Waste Isolation Pilot Project (WIPP), the underground dumping area for irradiated materials, and the magnificent Carlsbad Caverns--Cavern is a truly terrifying thriller, laced with flawless science, caving research, and an excellent romance.

9780743439800 | Atria Books, August 1, 2002, cover price $25.00 | About this edition: Unable to enter a cave since losing her assistant in a caving accident, marine biologist and cave researcher Whitney Burke must overcome her fears when her family is kidnapped while on a NASA-sponsored caving expedition.