Spelunker, scuba diver, and all-around adventure junkie James Rollins sold his veterinary practice in Sacramento, California, to concentrate full-time on writing books . His thirst for thrills clearly informs his bestselling Sigma Series novels, including The 6th Extinction and The Eye of God. His action/adventure thrillers seamlessly blend science, history, and fiction. They have been translated into more than 40 languages.