Puppeteers were willing to pay large sums of hush money in order to suppress even trivial details about their homeworld. In 2641 AD, it was discovered that the Puppeteers' homeworld had no moon, information deduced as a result of the solving of the mystery of the deaths of a crew of a ship investigating a neutron star. The ship, based on a General Products hull, was impervious to tidal forces but the crew were not. Because the Puppeteers seemingly have no experience of tides, they were unable to anticipate the deadly tidal forces. (As told in Niven's short story, "Neutron Star".) "Crashlander" reveals that the Puppeteers may have feigned their ignorance of tidal forces.