In London, Captain Francis Blake learns in the newspaper of the death of Lord Pitchwick, a good friend and former comrade of Oxford, and decides to go to his burial that afternoon despite being far from the south of England.

Mortimer can not help but share his thoughts on the theft that took place to the Curator, overheard by the Chief Warden Mac Tearaway and simple-minded assistant Alfred Clayton who owes his job to Lisa.

That same evening, the mysterious ghost returns to steal a vase of no great value at the Ashmolean Museum without the chief guard being able to stop him, knocked out by an accomplice.

He reveals to Mortimer the existence of the "TE Spirit Society", whose five members share a heavy secret and confesses to him the suspicion of the fifth Lord of all these crimes.

Back at his hotel, Lord Davlon receives an anonymous message that infuriates him: he rushes out with his car and is the victim of a road accident caused by the ghost.

Blake finally reveals the whole story to Mortimer: then a student at Oxford University, he creates with his four titled friends the "TE Spirit Society" to defend the work of their hero, Lawrence of Arabia.

Blake and Mortimer discover that the two criminals are Lisa Pantry and Alfred Clayton, Lawless's children who wanted to avenge their father after reading the letter he had left.

He gives Mortimer a letter announcing that Sir Hugh Calvin, Professor Raymond Vernay and Leslie Macomber are co-opting him to be part of the Centaur Club in exchange for a service rendered.