Carter Hastings

When a series of backyard pool homicides are reported in California, the BAU team searches for an UnSub which has a puzzling past.

Booth and Brennan are shaken when they must investigate the gruesome death of an old friend. Aubrey's dad reappears after years of being out of the picture.

A man dressed as Santa robs a bank and gets lost in a Santa flash mob, Sharon's children come to town for the holidays, and Buzz starts training as a back-up police officer.

Polly is nervous about applying for a promotion; Max and Elaine try to make sure that Natalie and Polly are living up to their full potential.