New York City is full of lonely hearts seeking the right match, and what Alice, Robin, Lucy, Meg, Tom and David all have in common is the need to learn how to be single in a world filled with ever-evolving definitions of love.

An affable underachiever finds out he's fathered 533 children through anonymous donations to a fertility clinic 20 years ago. Now he must decide whether or not to come forward when 142 of them file a lawsuit to reveal his identity.