: Brandt’s heart starts beating as Claire’s stops, signaling she is his mate.
: Brandt turns Claire into a vampire against her will to save her; she initially rejects him and the life he has thrust upon her. Immortal Promise by Kim Loraine
While it is a standalone, reviewers suggest reading (Mattias and Elaine's story) beforehand, as the events of Immortal Promise take place shortly after that book's conclusion. Immortal Promise (Vampire Mates) by Kim Loraine - Goodreads : Brandt’s heart starts beating as Claire’s stops,
: A common critique is its length (roughly 96–122 pages). Some readers wished it were a full-length novel to allow for deeper world-building and more resolution for side characters. Immortal Promise by Kim Loraine