Man-Kzin Wars IX Fly-By-Night is story by Larry Niven set in the Known Space and about Beowulf Shaeffer, ex-pilot and adventurer. Published in Man-Kzin Wars IX.

Set after the events of "Procrustes" (see the collection Crashlander), Shaeffer finds himself onboard a passenger ship, the Odysseus, just as it is being captured by a ship of Kzinti pirates. Shaeffer is taken prisoner and develops an unusual alliance with a non-practising Kzinti Telepath, "Fly-by-Night" and his octopus-like Jotoki slave, "Paradoxical".

Other stories mentioning Angel's Pencil are The Colonel's Tiger and Telepath's Dance

Beowulf Shaeffer stories

Neutron Star, the first story in the Beowulf Shaeffer series.
At the Core, the second story in the series.
Flatlander, the third story in the series.
Grendel, the fourth story in the series.
Borderland of Sol, fifth story about Beowulf Shaeffer
Procrustes, the sixth story in the series.
Ghost, the framing story in the collection Crashlander.
Fly-By-Night, the seventh story in the series, written after Crashlander.