Set four years after the events of Book 2. This time, William and Halley went back to being together and Sarah has made some 'interesting' life choices. Let's follow our favorite couple as they go through life while watching their children grow up and experience life.

Set several years after the last chapter, join the Hofstadter family's adventures as Sarah goes through puberty while William comes into his own, always trying to prove himself to be the smart and sassy product of Leonard and Penny.

This is an alternate story line on how Leonard and Penny met and the development of their relationship.