Time Shelter by Georgi Gospodinov (Trade Paperback)

In Time Shelter, an enigmatic flaneur named Gaustine opens a clinic for the past that offers a promising treatment for Alzheiner's sufferers: each floor reproduces a decade in minute detail, transporting patients back in time.  But as the rooms become more convincing, an increasing number of healthy people seek out the clinic as a time shelter, hoping to escape from the horrors of our present - a development that results in an unexpected conundrum when that past begins to invade the present.