S18, E13: When art dealer Audrey Lortell (guest star Lisa Peluso) is found stoned to death, Detectives Cyrus Lupo (Jeremy Sisto) and Ed Green (Jesse L. Martin) suspect her killing may have been linked to some of the cultural and religious artwork showcased in her gallery. After Lupo listens to an intimate taped conversation between Lortell and an artist, the detectives look further into her personal life; uncovering infidelity and her son's, Jason (guest star Will Denton), troubled past and current involvement in a fanatic religious group. Initially, the murder appeared to have a terrorist link, but Jason's new behavior suggests the killer is closer to home. Also starring: Sam Waterston, S. Epatha Merkerson, Linus Roache, and Alana De La Garza.