Until I Die by Amy Plum

Kate and Vincent can finally be together, with no threats, like they've wanted all along. But they soon realize that there is one thing that they can’t get around, and that's Vincent's fate. Kate can’t handle death all of the time after her own parents death, but that’s Vincent’s lifestyle, he is drawn to dying for other people. Another part of who Vincent is is that he's immortal, there's not much they can do to get around that; someday Kate will die and Vincent will still roam the earth for years later. Vincent promises Kate that he will try his best to live a normal life but then a new enemy arises. This is a classic "second book" but still just as captivating and thrilling as the first. This book does bring you deeper into the history and lore of the revenants.

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