"A fascinating exploration of the mysteries ignited by DNA genealogy testing—from the intensely personal and concrete to the existential and unsolvable." —Tana French, New York Times–bestselling authorYou swab your cheek or spit in a vial, then send it away to a lab somewhere. Weeks later you get a report that might tell you where your ancestors came from or if you carry certain genetic risks. Or, the report could reveal a long-buried family secret that upe...

A deeply reported look at the rise of home genetic testing and the seismic shock it has had on individual livesYou swab your cheek or spit into a vial, then send it away to a lab somewhere. Weeks later you get a report that might tell you where your ancestors came from or if you carry certain genetic risks. Or the report could reveal a long-buried family secret and upend your entire sense of identity. Soon a lark becomes an obsession, an incessant desire to find an...