Watch Out! She's a Mastermind Heiress

Isabella Patton is twenty one and has just been sent back to the wealthy family she was born into, after growing up in the countryside. The place in that family is not hers. Her cousin Eliza was raised by the Pattons in her stead and is working to turn all of them against Isabella for good. Isabella has a background in medicine and in technology, and she gets the better of Eliza each time the two of them come up against each other. As what she can do becomes known, her five brothers and her parents come round to her, and she ends up the one the Pattons put first. Oliver Bates, older than her and engaged to her without knowing it is her, pursues her the whole time, and she stays a step out of his reach.