Oathbreaker, book 2: A Prince Among Killers
Susan Vaught et J. B. Redmond2009

The second half of the Oathbreaker story opens at the assassins' stronghold, Triune, as Aron and his sworn comrades try to find peace in a world on the brink of war. Dari and Stormbreaker grow closer as they search for Dari's missing twin; Nic and his captors find it harder to conceal their secrets; and Aron must decide whether the bond he keeps to his family will prove stronger than the oaths he has sworn to his closest friends.