When the BAU team travel to Denver to investigate several murders, Prentiss is forced to evaluate her relationship with Special Agent Andrew Mendoza.
The Big Three celebrate their 41st birthday and Kate reminisces about her 36th birthday and how things have changed since then.
Kara offers to help Winn when his homicidal father breaks out of prison. Alex convinces Hank to get inside Lord Industries.
Katie and Will are pushed even further apart when she makes a stand against his best-laid plans; Maddie makes a bold move.