The Portal Trilogy Series by Heather Self

Stranded on Earth two thousand years they’ve waited for the arrival of the One: some to save her, others to kill her. With her birth, the ancient prophecy could at last be fulfilled and the doorway between the worlds would open. Those who know the prophecy believe this event occurred almost eighteen years ago, and now, they’ll stop at nothing to find her. Seventeen-year-old Eveline has lived her entire life on the move and she hates it... moreStranded on Earth two thousand years they’ve waited for the arrival of the One: some to save her, others to kill her. With her birth, the ancient prophecy could at last be fulfilled and the doorway between the worlds would open. Those who know the prophecy believe this event occurred almost eighteen years ago, and now, they’ll stop at nothing to find her. Seventeen-year-old Eveline has lived her entire life on the move and she hates it. She knows her parents believe she’s the One, and they’ve done whatever it takes to stay one step ahead of those who want her dead. But Eveline isn’t fully convinced that her parents’ beliefs match her own. What she does believe is that Leadville, Colorado may be the chance she’s been waiting for. The chance to be somewhere safe. The chance for her to make friends and have fun. The chance to finally date a guy. The chance to be a normal girl, at least as normal as possible for someone not human. less

Mary Anne Moore doesn't know what she is. She can’t explain why she has lived so long. Or why she never gets sick. Or why the dreams she has come true. She has hidden herself as a lowly servant to the households of Dublin's English elite for decades, until the night that changes her life. Now her sole purpose is the child she never expected to have. She will do anything in her power to keep the black-eyed monsters from discovering him and turning him into one of them... moreMary Anne Moore doesn't know what she is. She can’t explain why she has lived so long. Or why she never gets sick. Or why the dreams she has come true. She has hidden herself as a lowly servant to the households of Dublin's English elite for decades, until the night that changes her life. Now her sole purpose is the child she never expected to have. She will do anything in her power to keep the black-eyed monsters from discovering him and turning him into one of them. For Kieran Moore, the dark is an ever-present parasite, waiting to devour his humanity. His mother’s love and the girl in his dreams has kept it at bay for years, but the more time that passes—the longer he has to wait for her—the more it grows. When tragedy strikes, it is all he can do to keep from being consumed by the darkness that infects him. He must continue to hold on to the hope of peace her presence will bring him, because it’s not just his fate on the line, but that of the entire world. less