The Songs of Eirren Series by Edith Pattou

Collun has always been happiest working in his garden. But his peaceful life is shattered when his sister, Nessa, mysteriously disappears. He sets off to find her and soon realizes that he and his traveling companions, including the feisty young archer Breo-Saight, have become involved in something much larger and more sinister than he had imagined.

Breo-Saight, the young archer from Hero's Song, has abandoned her lifelong mission to avenge her father's murder. But just as she stops pursuing the murderers, they turn up again, leading Brie to her birthright--a fire arrow.The magical arrow leads Brie to a strange country, where she finds the family and happiness she's never known. But she also finds evil at work--the doings of a sinister, one-eyed sorcerer named Balor... moreBreo-Saight, the young archer from Hero's Song, has abandoned her lifelong mission to avenge her father's murder. But just as she stops pursuing the murderers, they turn up again, leading Brie to her birthright--a fire arrow.The magical arrow leads Brie to a strange country, where she finds the family and happiness she's never known. But she also finds evil at work--the doings of a sinister, one-eyed sorcerer named Balor. Though Brie has given up on vengeance, she knows she must follow her mission through to its bitter end if she is to save the people she's grown to love. less