Prelude to Claimings, Tails, and Other Alien Artifacts
This is a collection of short stories, and the first story shows us how Ondry and Liam first met, told from Liam's perspective.
The other three stories tell us about the happenings from the beginning of Claimings, Tails, and Other Alien Artifacts, this time from Ondry's perspective, and from the perspective of a Grandmother.
I absolutely loved them all! I now have the urge to re-read this series, which is exactly what I am gonna do :)