London, January 1349. One lone apothecary engages in a futile battle against the rising tide of death brought on by the Great Pestilence. But there is something different about this man. In fact, Dr. Drake Stilson is there for a very specific purpose: find Henry and ensure he survives the worst of the epidemic sweeping the Western world.Now if only Drake knew which Henry. This is far from the first time Drake - an employee of The Oracle Group, a military and scientific organization dedicated to correcting the damage done by people messing around with time travel - has been sent to a distant time and place, expected to do the impossible. Yet this is the first time he's felt as if the battle is lost before it has even begun. Surrounded by fear and loss, Drake is on the verge of surrendering to the inevitable when disaster strikes.Despite being partners in work and life, Jens rarely sees Drake. He would love to ask Drake to quit his job, but can't bring himself to be that selfish. This latest assignment, though, is stretching them both to the limits. And when Drake runs into trouble, Jens's world begins to crumble. Now he has to figure out how to get himself to the right place and time to save Drake and bring him safely home.