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He took them in at a swift glance. No use. No one he knew, except—he responded to the greeting listlessly—a gentleman to whom he had spoken on the train, and farther off a familiar face from the metropolis. (The Burning Secret, Stefan Zweig)
What does the marked phrase above mean?
"Farther" is a comparative form of "far" (see the OED).
The phrase "farther off" means "further away": that is, more distant.
A "familiar face" (see meaning 4 in the Oxford Learner's) is simply a face which is familiar; here it's being used to mean a person whom the character recognises.
So the phrase "No one he knew, except a gentleman, and farther off, a familiar face." means he knew two people: one was a gentleman to whom he had spoken on the train, and one was someone he recognised who was more distant in space.
