"Jacob" is a captivating romance novel by Frank Jacquelyn, part of the Nightwalkers series. Published by Kensington Publishing Corporation in 2006, this mass market paperback book follows the story of Jacob, a powerful demon tasked with enforcing the ancient law against loving humans. However, when he meets Isabella, everything changes as he is powerless against the uncontrollable desire and volatile attraction. With a mix of fiction and romance elements, this novel is sure to captivate readers with its compelling story and charismatic characters.