A tattoo investigation leads the team to Rich Dotcom, who's forced to help them crash a party held by his college's secret society; Roman and Jane visit their childhood home; Reade continues to see Niki. Ennis Esmer guest stars.
Weller begins to unravel the mystery of Shepherd's complicated role in his past, which started during his military school days; Patterson uses an ethically questionable surveillance program; Reade continues along a self-destructive path.
Jane and Roman enter a risky weapons deal with a biker gang, in the hopes of ambushing Sandstorm and capturing Shepherd - but can Roman stick to the plan? Meanwhile, Patterson and Reade deal with personal demons.
When the team learns that the CIA deputy director who tortured Jane has made a risky deal with a terrorist leader, they must collaborate with him to prevent a national security threat; a criminal profiler studies Roman.
The team must rescue Patterson from her new, deadly nemesis, but can they get to her in time? Meanwhile, Jane struggles to win back Roman's trust after erasing his memory, and Reade and Zapata reach uncharted waters in their friendship.