Aldin Hoffmann

Aldin is a relatively minor functionary in the Immortal Library of the Great Architect in the catacombs under Paris. He is the brother of Jiminez Hoffmann, and so that is presumably his last name, too, but this has not been officially established. In the past he has evidently been assigned to work with/mind his brother whenever the latter fellow finds his way into the Library, a task which Aldin does not appear to relish. His superiors, on the other hand, are hinted to very much enjoy reading the resulting reports.

He enters the story when he is assigned to assist Agatha with her study of the Van Rijn notebook she has just donated to the Library. He comes across as being rather timid and fretful, but it is eventually revealed that this attitude is to at least some degree a ruse. He helps/follows Agatha when she finds her way into Van Rijn's long-lost Hermitorium, and then accompanies her and her friends into the sealed ex-Corbettite artifact vaults which are present in the Library's territory, as they search for the missing Doctor Dio Zardilev

He is engaged in some sort of clandestine activity with the Arguron princess Larana Chroma, a fact he wishes to conceal from both his brother and Agatha.