Alastair D’Argyll, known as Sir Lucan, serves as The Order’s Knight Commander. He is the adopted son of the Lord Chancellor and brother to Lady Igraine. Lucan is forthright and steadfast, and tends to play by the rules. But his respect for Sir Perceval induces him to allow Perceval’s squad to pursue their investigation of odd happenings in Mayfair and Whitechapel.