In the series' first two-hour episode, Mac is called back to his previous career in CIA intelligence when an agent is found fatally poisoned in a hotel room. Before dying, the agent had grabbed the Venetian blinds over his window and twisted them. Mac and the intelligence community realize the dead man was identifying his killer as "Venice," a notorious rogue agent who sells secrets anywhere and murders anyone who might recognize him. Mac and other agents seek out a woman named Elena Standish, an undercover operative who is the only person to survive a Venice attack. ...