Follows the lives and families of three adults living and growing up in the United States of America in present and past times. As their paths cross and their life stories intertwine in curious ways, we find that several of them share the same birthday - and so much more than anyone would expect.

Si chacun d'entre eux est confronté à des problèmes différents, Jack, Kevin, Kate et Randall ont notamment en commun la même date d'anniversaire.