Dollmann

Arthur H. Davies

Davies suspects Dollmann of treason and spies on him, creating a tense adversarial dynamic.

Carruthers

Carruthers views Dollmann with suspicion and is part of the effort to expose his treachery.

Grimm

Dollmann and Grimm are associates in the German intelligence network, though their trust is limited.

Davis

Davis and Dollmann have a limited professional connection, possibly as a subordinate or informant.

Arthur H. Davies

Davies suspects Dollmann of treason and spies on him, creating a tense adversarial dynamic.

Arthur H. Davies

Davies suspects Dollmann of treason and spies on him, creating a tense adversarial dynamic.

Davis

Davis and Dollmann have a limited professional connection, possibly as a subordinate or informant.

Carruthers

Carruthers views Dollmann with suspicion and is part of the effort to expose his treachery.

Carruthers

Carruthers views Dollmann with suspicion and is part of the effort to expose his treachery.

VII: The Missing Page

Owner of the Medusa; described as tall, thin, with greyish hair and a bulging forehead; initially cold but later friendly.

The Theory

Dollmann is discussed as the man who tried to drown Davies, has headquarters on the coast, and is in with German naval authorities.

IX: I Sign Articles

Discussed as the primary suspect; Davies believes he is an English traitor working for Germany who attempted murder.

XI: The Pathfinders

Implied as the owner of the Medusa, which is outward bound; the lady inquirer may be connected to him.

XIII: The Meaning of Our Work

Dollmann's treachery is mentioned as the motive for the quest, though Carruthers feels they have not yet found a really adequate motive for it.

The First Night in the Islands

Mentioned as a possible agent behind the prowler; Davies and Carruthers speculate whether Dollmann knows of their return and might resort to violence.

Commander von Brüning

Mentioned as being away; von Brüning notes his yacht is back and that he is largely interested in the treasure company.

Clearing the Air

Discussed as a suspected traitor and the target of their investigation; his attempt to wreck Davies is the foundation of their suspicions.

XIX: The Rubicon

Mentioned as being away in Amsterdam; expected back soon; Fräulein Dollmann says he may not approve of her visit.

The Little Drab Book

Identified as the author of the guidebook under the pseudonym Lieutenant X⸺, a former British naval officer now living in Germany; his past and secrets are the focus of the chapter.

Blindfold to Memmert

Dollmann is mentioned as one of the men who went to Memmert, and his presence is part of the motivation for the journey.

The Quartet

Present at the meeting, appears uncomfortable, speaks in a dogged monotone, mentions inviting 'them both' to supper.

A Change of Tactics

Subject of suspicion; his book was hidden, suggesting he is concealing his past from von Brüning and Böhme.

Finesse

Host of the dinner; cordial and boisterous, but Carruthers views him as a central figure of hidden guilt and potential betrayal.

XXV: I Double Back

Mentioned as a spy for English plans and as active in island development.

We Achieve Our Double Aim

Confronted by Carruthers and Davies; claims to be in British service; later disappears overboard.