Neutron Star vintage paperback book by Larry Niven about Beowulf Shaeffer hired by aliens to investigate why others died near a neutron star

Come to Larry Niven's Universe and meet all the natives: Thrints, Bandersnatchi, Puppeteers -- and a host of other wonderfully created characters.
Visit Lookitthat, Down, and Jinx -- indeed, an entire galaxy of planets found only in these stories that trace man's expansion and colonization throughout Known Space.
A spectacular cycle of the future . . . a 10,000-year history of man on Earth and in space!

CONDITION: VG- **PLEASE SEE PICTURES.