Book 1

Reap the Wild Wind

by Julie E. Czerneda

Published 4 September 2007
In the first book of the Stratification series, set in an earlier time in Czerneda's Trade Pact Universe, the Clan has not yet learned how to manipulate the M'hir to travel between worlds. Instead, they are a people divided into small tribes, scattered over a fraction of their world, and prevented from advancing by two other powerful races who control both technology and terrain.

Book 2

Riders of the Storm

by Julie E. Czerneda

Published 1 September 2008
Continuing the story of the origins of the Clan and their discovery of how to travel through and draw upon the power of the M'hir, Riders of the Storm focuses on Om'ray Aryl Sac, who is gifted with this forbidden Talent. Aryl and her companions have found a new home in the mountains, but before long, their haven becomes a magnet for conflict.

While trying to rebuild the divided village of Sona, Aryl must also safeguard the secret of her Talent from other arriving Om'ray who seek to use her power. Aryl becomes Clan Speaker to negotiate the peace, but tensions escalate, blood is spilled, and her fate-as well as Sona's-hangs in the balance.

Book 3

Rift in the Sky

by Julie E. Czerneda

Published 7 July 2009
The space-capable members of the Om'ray species are converging on the Sona settlement, a situation that prompts the M'hiray to plan the evacuation of Cersi to prevent a disruption of the peace-keeping Agreement.