Book 1

Emprise

by Michael P. Kube-Mcdowell

Published 1 June 1985

Book 2

Enigma

by Michael P. Kube-Mcdowell

Published 1 May 1986

Book 3

Emprey

by Michael P. Kube-Mcdowell

Published 1 January 2005
The first human interstellar civilization was destroyed by the Mizari-alien Sterilizers from a black star in the Ursa Major cluster. Sixty thousand years later, humanity's far-flung remnants have reunited to form a new galactic empire. A system of Sentinels and Shields monitirs the frontier, while mighty Defender ships protect the home worlds.