Sabrina and Vince respond to a gun call at a library, drawing them into a fast-paced case involving ghost guns, a looming sextortion deadline, and a desperate young man caught in the middle.
A surprising discovery leaves Alex reeling as he tries to adjust his theories in light of what he found at Philadelphia City Hall. Meanwhile, the Rezident questions Katya and Mark’s dedication and Natalie discovers the dangers of Black Dagger.