The Stretton Street Affair by William le Queux

The means by which the unfortunate Baron van Veltrup had met with his death was as ingenious as that practised upon me by the expert thief, Despujol. As I reflected upon all the details as related to me by the valet, Folcker, I suddenly recollected that the Baron's strange visitor, the man who must have placed that sharp scrap of razor-blade within his glove at the moment when the unsuspicious victim had gone outside to speak with his servant, was described as a man with a red face and a dark moustache.

A man who answered such description was the elusive friend of Mademoiselle Jacquelot, of Montauban, the motor bandit Mateo Sanz -- the man who had so cleverly evaded the police, and who had no doubt been an intimate friend of Despujol! In order to confirm my suspicions, I at once telegraphed to Senor Rivero in Madrid, urging him to send me a copy of the police photograph of Sanz for identification purposes. That same day I received a reply which informed me that the photograph was in the post, hence I remained in Amsterdam awaiting its arrival.