After a key witness and a U.S. marshal are ambushed and killed, Maggie and OA must track down a man who leaked the information that led to their murders.

In the wake of a murder on campus, the line between free speech and hate speech at a university is examined.

Green and Cassady get mixed up with the Russian consulate after Peter Rostov dies of ricin poisoning. Their investigation leads them first to his work, where they learn he spent…