Don had watched as Charlie had stormed out of the bullpen, furious at his FBI agent brother following one of their arguments. What Don didn't know, what he could never know, was that he might never see his little brother again.

Margaret Eppes is dying and they are not handling it well. Pre-series.

A Mall has collapsed trapping a lot of people including Charlie and Colby. Will they survive? Friendship story not slash.

In "The O.G" Charlie said he wanted to kill Bob as example when explaining theory to Don. After the case ended Don remembers who Bob is.