Quincy goes to the Nomad Hotel in Lake Tahoe for a pathology convention. The convention draws to a close and Quincy prepares to return home – and then the hotel physician Dr. Larry Pines has Quincy paged. Several hotel guests have developed fevers, coughs, and extreme tiredness. Quincy and a few of his fellow pathologists must discover what’s wrong with these people – and the symptoms are disturbingly similar to Legionnaire’s Disease. Complicating matters are the hotel owner Al Ringerman’s desire to keep the illness out of the papers, and the presence of Rawley Dinehart, who just might be a syndicate front man here to muscle in on the hotel business. Quincy races the clock to figure out what’s killing the hotel guests.