Norton, Andre - Moonsinger 1 - 5

Moon Magic, or Free Traders, or Moon Singer 1 - 5
The primitive world of Yiktor, evoked from myth and legend and ingeniously fused with the future, greets readers with medieval heroes and mysticism, singing prose and an eerie tales.

Moon of Three Rings (1966)

Moon of Three Rings is the first novel in the Moonsinger series. Krip Vorland is assistant cargomaster on the Free Trader ship Lydis. Maelen of the Kontra is a Moon Singer of the Thassa. Both have come to Yrjar on Yiktor for the great trade fair.

Exiles of the Stars (1971)

While on a mission for the Thothian priests, the Free Traders' ship is forced down on a barren and seemingly uninhabited planet.

Flight in Yiktor (1986)

A psychic sorceress, a telepathic adventurer, and deformed ex-slave use their extrasensory powers to stop an intergalactic organization of thieves from looting the planets.

Dare to Go A-Hunting (1989)

Krip Voreland, interplanetary Free Trader, Maelen, sorceress of the Moon of Three Rings, and Farree, an orphan with iridescent wings, search for the mystery of Farree's ancestry, the secret of this race of winged people known as the Little People and their well-guarded treasure.

Brother to Shadows (1993)

Cruelly cast out of an order of spies, assassins, and bodyguards, Jofre is forced out into an unfamiliar world, where he encounters an obsessed alien archaeologist and a beautiful, deadly rival. Included in this collection because that's how it came to me, this book isn't directly connected to Moon Singer. But it's in the same universe and has a simular tone.