Murder on the Golden Halo

The Earth wars that encompassed dozens of systems ended with the Earthlings all but being wiped out. The few that are left a mistrusted and in many places hated. It is hard to find work and avoid trouble. One Earthling who once a detective back on Earth saves the life of a very powerful alien. She rewards him by giving him a job. The Golden Halo is a beautiful space ship that caters to the rich and powerful.
When the fiancé' of a queen is murdered. The Earthling is called upon to investigate with the help of a pink haired princess who loves everything about Earth.