Dexter must do damage control; Debra's speculation begins to take shape; Quinn becomes involved in a homicide.
Emily helps Nolan's bride deal with her secrets; Victoria faces a mysterious new socialite.
Don and his team call on a senior sniper instructor from Quantico (Lou Diamond Phillips) to help them stop a shooter who goes on a killing spree in Los Angeles.
When Allison gets a skin graft on her hand after it is burned, she wonders why the hand acts with a mind of its own; Bridgette keeps her role on the soccer team a secret from her parents.
Sipowicz responds to a shootout between police and a Mafia man.