When Isaac Ollerton and his father, known as the Spymaster, almost come to a dead end with their case, a young and irresistibly beautiful barmaid has an idea they haven't even thought of. It looks preposterous at first but the more they think about it, the better it sounds. Isaac is an ambitious young man, willing to follow his father’s path and become a good spy. He’s attracted to powerful women and knows how to handle them. But will he able to cope with the charms of this mysterious Lady? Mary Warwick leads a simple life, working hard as a barmaid at the tavern Mr. Ollerton and his father frequent. She had seen the life of the regents and is still gathering herself from being cast away from the house of one. However, an unprecedented proposal is about to change everything. Is she willing to risk everything and give in to passion? When love blossoms in the most unlikely situation, it can threaten to sabotage the entire case. What happens when demons from Mary’s past refuse to leave? Is love strong enough to last or do the obstacles manage to destroy every piece of it? "The Irresistible Allure of a Lady Spy" is a historical romance novel of approximately 80,000 words. No cheating, no cliffhangers, and a guaranteed happily ever after.