Dr. Lewis' sister returns, claiming to be sober and wants custody of the daughter she abandoned.
Three United Nations delegates visit: a physician who is similar to Charles, an Army officer who teaches yoga and a Swede who catches Margaret's attention.
Cory has a hard time with the fact that graduation is bringing unexpected changes.
Warrick investigates the drive by murder of a young girl in his old neighborhood. (TV-14)
When the chief investigator of a controversial report documenting corruption within the NYPD is gunned down the day before his findings are published, Mac and Stella must find the killer, launching a massive search that makes every officer listed in the report a suspect. (TV-14)
