The Main Chance. (Pocket Books)

Tweed and Paula face their strangest and most suspenseful case yet - a case Tweed nearly doesn't crack. A terrifying epidemic threatens the West, bringing down old and young alike, indiscriminate and swift. Tweed and his team put their own lives at risk as they race against time to track down the disease's provenance - only to find that an individual, much closer to home than they ever imagined, has the cure. The price exacted is higher than anyone could have possibly believed, and the choices facing Tweed are near impossible.