From the back cover:
A mysterious hospital is erected in Split, Croatia that claims to cure all types of paralysis in a matter of hours with no surgery. The global scientific community is baffled.
Despite the U.S. and a handful of other countries warning its citizens to avoid the treatment, people from all over the world descent on the city and are cured. But when these patients return home and resume their lives, they suddenly begin committing random violent acts of terror.