'Camera Obscura', written by Lloyd Rose, features the Eighth Doctor, Fitz Kreiner, and Anji Kapoor.
Back Cover Blurb
The Doctor sat alone and listened to the beat of his remaining heart. he had never got used to it. He never would. The single sound where a double should be. What was this new code hammering through his body? What did it mean? Mortal. No, he'd always known he coudl die. Not mortal. Damaged. Crippled. Through his shirt, his fingers sought out the thick ridge of his scar. Human...
The Doctor's second heart was taken from his body for his own good, he was told. Removed by his sometine ally, sometime rival, the mysterioud time-traveller, Sabbath. Now, as a new danger menaces reality, the Doctor unwillingly finds himself working with Sabbath again. From a seance in Victorian London to a wild pursuit on Dartmoor, the Doctor and his companions work frantically to unravel the mystery of the latest threat to Time...Before Time itself unravels.