Selkie - The Selkie Trilogy, #1

Annie Jacobs's marriage fell apart, leaving her heart and her trust broken. Even her friends couldn't ease the pain of betrayal and eventually, Annie packed up her life and moved on. In peaceful Bar Harbor, Maine, Annie is finally able to find solace. She makes new friends, she finds a new routine, and she begins to pick up the shattered remains of her confidence. Just when Annie thinks she's found contentment once again, a series of chance disasters threatens her new life and nearly ends her life entirely.
When the man who saves her turns out to be something more than Annie ever would have expected, her life is thrust once again into turmoil. A near-death experience takes Annie into an entirely new world, one she would never have believed existed. It seems like DEATH has its sights set on Annie for sure this time, and war is closing in. Even immortality may not be enough to save her now.