Justice Hall is the sixth book in the Mary Russell series by Laurie R. King. In this installment, Mary Russell has accepted her tumultuous relationship with her now-husband, Sherlock Holmes and is looking forward to some time alone. However, fate intervenes, and their old friends, Ali Hazr and his brother, Mahmoud, now released from their disguise and known as Alistair and Marsh (characters from the previous book O Jerusalem).