There are 4 books in the Snow Queen series. The newest book is Tangled Up In Blue which came out in 2000.

1
The Snow Queen

Book cover of The Snow Queen

This reissue of a modern classic of science fiction, the Hugo and Locus Award-winning and Nebula-nominated The Snow Queen, marks the first time the book has been reprinted in fifteen years.

The imperious Winter colonists have ruled the planet Tiamat for 150 years, deriving wealth from the slaughter of the…

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2
World's End

World's End
BZ Gundhalinu left Tiamat before the Stargate closed, cutting himself off forever from the woman he loves: Moon Dawntreader Summer is now the Summer Queen and BZ knows he can never again be her lover. This novel is volume two in "The Snow Queen" cycle.

3
The Summer Queen

The Summer Queen
Moon, reigning as the Snow Queen, tries to keep her people from the tyranny of the Hegemony, while solving the mystery of the otherworldly Mers

4
Tangled Up In Blue

Tangled Up In Blue
In a novel set on the world Tiamat, two groups of policemen show up at an unauthorized raid of a warehouse full of forbidden smuggled technology with deadly results.