I wish they would go back to the practice of evocative titles that actually jog your memory of the story inside. In this case, the Undefended City is Mexico City and how the Spaniards conquered them. (They were thought to be Gods because some of them were blond with light eyes, so defenses were down).
The same thing happened to the hero – he thought he had the upper hand (English heroine was naïve), but he found himself in love with her by the end.
Orphaned heroine is a wealthy heiress. Her overbearing paternal aunt takes care of her by harping on her physical, emotional and mental fragility. Heroine has a heart condition of some sort, but her main problem is that she has been meekly obedient her whole life in the hope that someone – anyone – will care about her.
They have traveled to Mexico City to visit her maternal uncle and perhaps be betrothed to her cousin to keep all of that nice money in the family. Hero is an employee of the uncle’s. He is an engineer and has been responsible for the uncle’s financial success for several years. He sees how a marriage to heroine could be advantageous, but this reader never really thought his heart was in the golddigging. He seemed to feel sorry for the heroine at first and then intrigued.
Heroine has no idea of these machinations, so she is shocked when she overhears her aunt telling the hero of her uncle’s plans to marry her off to the cousin. She heads to the bus station and takes the first bus that is leaving – unfortunately it’s a ten hour ride to an interior city. Fortunately, the hero is following in his car and the city is where his godmother lives so she can offer heroine a bed for the night and lots of gossip and backstory about the hero.
Hero proposes and heroine accepts. They helicopter to the uncle’s country estate and there everyone tries to talk her out of marrying the hero. This is where the heroine stops being a doormat and starts to exhibit her personality.
Hero still has to work, so they do not spend much time together before or after their wedding. Hero becomes jealous and petulant and heroine is set to leave him until a work place accident sends her to his side. HEA
The romance isn’t all that convincing but there is a full complement of characters who are fascinating as well as the lovely Mexican setting. This is vintage goodness, but if you don’t have patience for meek heroines, you’ll be frustrated by this one.