Question

According to Ausable the evening spent in a French music hall boring for Fowler how?​

Answer 1

Ausable thought that Fowler was bored because he thought that Fowler had spent a dull evening in a French music hall with a sloppy fat man who instead of having secret messages manages to get only a prosaic telephone call making an appointment in his room.

Answer 2

Fowler was disappointed because he was told that Ausable is a spy, a secret agent dealing with extreme danger. But, when he saw Ausable, who did not even fit in the discription of a secret agent, he was very fat, sloppy and a boring man.