This episode recounts a hot summer night in September, recalling events that occurred earlier in the chronology of the season. The squad works the night shift, but no homicides are reported, leaving the detectives to brood over their personal matters. Bayliss is still investigating the Adena Watson murder but makes no progress, prompting Pembleton to encourage him to approach it from the mind-frame of a criminal. This advice leads Bayliss to a breakthrough discovery. Meanwhile, Howard learns her brother-in-law has been cheating on her sister, and Felton surprises Howard by offering her genuine words of comfort. Bolander contemplates asking Blythe on a date and, when he finally builds up the courage, she accepts. Throughout the night, the detectives encounter several odd characters, including a criminal who dresses like Santa Claus (Cleve Wall) and a cleaning woman (N'Bushe Wright) who keeps her baby in an animal carrier while she works.