After Billy Darley is betrayed, he's saved by Spencer Reid who takes him home. Bobby and Jack Mercer don't trust Billy, but Spencer wants to help him find out what happened. But who would betray the most dangerous gang lord in the city? Billy X Spencer Jack x Bobby.

Spencer Reid is undercover as the team try to catch a serial killer involved in gang activity. Things don't go so well when Billy Darley takes a special liking to him. But so does the Unsub. Spencer ends up in the care of Billy-FULL SUMMARY INSIDE!

Spencer Reid is seventeen and on his way to joining the BAU, but when his father is murdered all that seems to keep him going is his work and...Billy Darley. When his mentor finds out about Billy, he is worried for Spencer and tries-FULL SUMMARY INSIDE!