Needs JAL info.
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Henry Gordon Jago was the owner of the Palace Theatre in London in 1889, where Li H'sen Chang performed his magic act.
Biography
Sometime prior to 1881 he presented the so-called "Monstre Gathering", which featured Madame Vastra (known as The Amazing Lizard Lady) as the main act. (REF: The Brilliant Book 2012)
While watching a performance by Chang, Jago noticed blood running down the side of his puppet. After the performance, he entered Chang's room and inspected the puppet to assure himself that it was blood. Confirmed in his theories he left.
Jago stayed at the house of Professor George Litefoot, where they were captured by a member of the Tong of the Black Scorpion. They managed to escape but were recaptured.
The gang's leader, Magnus Greel, was killed in a shoot-out, during which Jago was protected by Litefoot. (DW: The Talons of Weng-Chiang)
He may have sold the Palace Theatre after these events. (MA: The Shadow of Weng-Chiang)
His association with Professor Litefoot continued beyond their adventure with the Doctor. (EDA: The Bodysnatchers) The pair were involved as amateur sleuths in several other mysteries. (CC: The Mahogany Murderers, JAL: Jago and Litefoot)
He had an aunt named Maude who was still alive in the 1890s. She lived in Margate and had recently become engaged to a fishmonger named Robert Botcherby. (JAL: The Spirit Trap)
He was long dead by the time that the New Regency Theatre, which he had owned and operated in the 1890s, was destroyed in the Blitz at 8:47 p.m. on 12 October 1940. (JAL: Swan Song)