Darkness

S18 E2: During a blackout, a panic-button alert sends Detectives Ed Green (Jesse L. Martin) and Cyrus Lupo (Jeremy Sisto) to the home of a high level corporate executive, where they find a murdered housekeeper and his missing wife and daughter. Suspect Marty Dressler (guest star Patrick Stump, "Fall Out Boy"), an employee who works in the company's IT department, leads the detectives to the murderous plan. Also starring: Sam Waterston, S. Epatha Merkerson, Linus Roache, and Alana De La Garza.