Aria: Left Luggage (Paperback)

Alien Retrograde Infectious Amnesia
Today, Jack caught a bug at work. He catches a bus home. By the time he disembarks in the desert town of Rosamond, all the other passengers and the driver have fuzzy heads. Jack had caught an amnesia bug, and it's infectious.
Imagine the ramifications:
The passengers arrive home, infecting family; some shop en route infecting everyone they meet. The bus driver receives more passengers giving them change for last week's prices and today's amnesia. Some passengers work at the power plant, the water treatment works, the hospital, fire station. All shut down in weeks.
One man, Ryder Nape, realizes what's going on, but can he persuade friends to barricade themselves in a secluded valley, hiding from the amnesia bug
""Geoff Nelder inhabits Science Fiction the way other people inhabit their clothes."" - Jon Courtenay Grimwood
""Geoff Nelder's ARIA has the right stuff. He makes us ask the most important question in science fiction--the one about the true limits of personal responsibility."" -Brad Linaweaver
Robert J. Sawyer calls ARIA a ""fascinating project.""
""ARIA has an intriguing premise, and is written in a very accessible style."" -Mike Resnick