20. Art Imitates Art

Complete story — includes the ending

Exiting a gym late at night, Phoebe Elliot spots a car she thinks is her ride share, but is shot and killed. Sherlock and Joan come across a selfie the victim took, which was later enlarged and sold as "art". The art gallery where the piece was exhibited was broken into, and several works were stolen, but not the selfie. However, Sherlock notices that the selfie has been replaced with another with some background details removed, details which seem to provide an alibi for a man imprisoned for the murder of Marissa Kagan. Sherlock now suspects that Elliot was killed because she spotted the alteration. Kagan was having an affair with a married woman; when Kagan pressed her lover to get a divorce, she was killed by her lover's wife. The killer wanted to turn herself in, but her wife and Kagan's lover, Assistant District Attorney Christina Pullman, talked her out of it and proceeded to murder Elliot to cover up the first killing. Lin, Joan's half-sister, angrily tells her to stay away from her family after Joan reaches out to Lin's mother. Later, however, Lin reconsiders, and reconciles with Joan.