Something is causing an illness that makes people lose all sense of themselves. The illness causes a white fungus to form on their faces giving it the name White Mask.
At the same time, something else strange is happening to a small group of people. Shana's sister Nessie is sleepwalking and cannot be awoken. Shana follows her and as they go, more sleepwalkers are joining her. They cannot be stopped or communicated with. Soon there are sleepwalkers and their loved ones heading across the country.
Set is a familiar-feeling time politically, society begins to collapse. Terror and violence are rampant. The CDC assigns it best investigator to follow the sleepwalkers while others search for the origin of White Mask.
Wendig has written a compelling series. It is gripping, haunting and realistic. Book two takes place about five years after the onset of the disease, in the time after the illness has run its course. I HIGHLY recommend this two-book series. It is one of the best I have read this decade!
Wendig, Chuck. (2019). Wanderers. New York: Del Rey.