Le Serment des cinq lords

>1919: Colonel Lawrence - Lawrence of Arabia - has an unpleasant meeting with an MI5 agent who confiscates his manuscript of The Seven Pillars of Wisdom. >35 years later, Oxford is shocked by a series of burglaries at the Ashmolean Museum, at the same time as Blake learns of the death of an old friend. The captain begins an investigation, while Mortimer looks into the thefts... But what dark connection does all of this have with Lawrence and Blake's own past?