I really loved this book and I flew through it. I usually prefer historical novels to historical romances, but this book had two good plots and a third subplot which was enough to keep me interested. The novel is set during a typhoid epidemic in London, so everyone is terrified and to make matters worse it's the early 1800s - no one actually knows what causes typhoid or how to treat it, only that it spreads fast and it's deadly. This book was very appropriate reading during the Global Covid 19 Pandemic.
The Illegitimate Duke starts out with Juliette Matthews, a new member of society attending one of the balls during the London Season, e.g. the marriage mart. She knows she should find herself a husband but she's more interested in doing something useful with her new wealth. Well, her brother's new wealth. She meets a dashing, young doctor at a ball - a doctor who will have his uncle's title of Duke of Redding when his uncle dies. Juliette talks over her situation with her friends and decides to donate a considerable sum to Florian's charity hospital, and get herself on the board so she can have a say in how her money is spent. That being on the hospital board means spending time with Florian is a bonus.
Florian meanwhile wants to be a doctor, not a duke. But he isn't going to insult his uncle by refusing a title. And although he's immediately attracted to Juliette, he has secrets in his past that make him think he simply can't marry her.
While the ups and downs of Juliette and Florian's relationship make for interesting reading, we know it will all work out because: romance novel. Besides, I've already read the next book in the series, The Infamous Duchess. However, I enjoyed seeing the characters I had met before and seeing their friendships and charitable projects. For example, during one meeting Juliette and the other women with interest in the charitable hospital discuss needing an income stream for the hospital - they decide to build a spa catering to London's elite. The spa is under construction (they convert an old building) in the next book. I love how the characters' stories interweave and build on each other.
While initially, Juliette is just offering general financial help to the hospital, soon typhus breaks out in St. Giles, a notorious slum in London that Juliette had grown up in. Florian is soon off trying to help the sick. The British government quarantines the neighborhood and eventually even orders the military to shoot anyone trying to leave. Soon after at a hospital board meeting, Juliette proposes buying a ship so they can isolate the infected that way. This is a smashing idea.
Unfortunately, Bartholomew, the villain of the piece intercepts messages and the additional doctor sent to help the medical staff on the ship. He also causes all sorts of issues for Florian and his friends, including finally revealing Florian's secret in the press.
Meanwhile, despite the precautions taken - a young boy escapes St. Giles. He's found by Vivian, a close friend of Juliette's. The boy is taken to Vivian's house, where she tries to help him - but he soon runs off again. The boy infects Vivian and her mother with Typhus. Juliette goes to drop off a food basket at the house, enters, and realizes everyone there has Typhus - not wanting to spread the disease, she stays and contracts it herself. Vivian and her mother die, and Florian barely returns in time to rescue Juliette - he then brings her to her house for treatment (because: reasons he can't bring her to the hospital). Florian brings Juliette back to health, though he has to shave her hair (as well as wash her). They fall even deeper in love as Florian cares for her. Florian finally tells her his secret and she of course doesn't care about it. They are on the cusp of a marriage proposal. Juliette now well is to be sent to her brother's home by carriage - so Florian can deal with various things as well as formerly ask Juliette's brother's permission to marry her. But Juliette's carriage is attacked and she's kidnapped. Florian, Henry (his brother), and Juliette's brother have to rescue her, which they do. As expected, Florian and Juliette are then able to marry.
Again, I really enjoyed this novel a lot. The Typhus Outbreak was an extremely interesting plot and appropriate reading right now. Juliette is a great heroine - I loved her. Florian is a great hero, very dedicated to his work as a doctor and surgeon. Though his constant worrying about his reputation and past "harming" Juliette was a bit annoying at times. I also liked how the characters are forming a family, or at least a group of friends. It reminded me of great British historical television dramas like Upstairs, Downstairs and Downton Abbey. I highly recommend The Illegitimate Duke.