Yahrzeit: Part 1 (S06E11)

An anonymous package containing a Nazi S.S. dagger arrives at the team's office. It sparks an investigation into the cold case murder of a young Polish girl in London in 1945. As Boyd, Grace, and the team dig deeper, attention focuses on a London family and the secrets buried in their family home, leading to horrific discoveries about an unsuspected Nazi past which has survived to the present day. (iTunes)