John and Eva investigate the death of a homeless man whose best friend believes that his overdose was actually a homicide. They uncover a mysterious connection between the new homeless shelter and an expensive guitar the dead homeless man kept in his locker. Meanwhile, John remembers when he struggled with addictions and entered a 12-step program back in 1964 after passing out drunk one too many times and ending up in the psych ward on the “Keep The Change” episode of NEW AMSTERDAM