Dr. Sweets is apparently getting a little restless in heaven.
According to an insider, Avalon (last seen in Season 9 serenading Booth and Brennan at their wedding) arrives to help with a murder case and winds up being contacted by Sweets on his birthday.
I’m told John Francis Daley will not appear in the episode, but, hey, a Spectral Sweets is better than no Sweets, right? Riiiiight?!
Look for the episode to air in early 2015.