Sam and Kilbride clash when a case involving an arms dealerresponsible for the slaughter of ATF agents leads them to awell-connected colonel and friend of Kilbride, accused ofsupplying militia groups with guns. Also, Kensi and Fatima goundercover at a rehab facility to question the arms dealer'sgirlfriend.
Tensions rise as the group questions past events and plans forthe future. Things get explosive as someone's abilities andloyalties are put to the test. A surprising discovery is made.
Billy gets in with a questionable crowd. Isaac travels alone.Harris' investigation into the anonymous eyewitness continuesas a high school football player ODs.
Pulling up to her ten-year college reunion in style as analumni panelist, Issa's self-doubt quickly surfaces, whileMolly - still reeling from her breakup - struggles to get outof her own head. As the crew takes the opportunity to reflect,old wounds remain tender.
Vivien is trapped amongst the National Socialists. With timerunning out Vivien risks everything to make one last attempt tosabotage the fascists without being caught.
A wild stallion escapes from Sam's ranch during a burglary andAmy will stop at nothing to find him. Lisa's latest businessinvestment is at risk. Tim and Jessica adjust to life back atHeartland.