1. The article highlights several "unusual historical" novels that are perfect for summer reading. These books offer a fresh perspective on historical events and characters, providing readers with an engaging and thought-provoking reading experience.

2. One of the featured novels is "The Cartographer's Daughter" by Kiran Millwood Hargrave, which explores the life of a young woman in 18th-century London who becomes involved in the world of mapmaking and espionage. The author blends historical details with a captivating narrative to create a unique and immersive story.

3. Another book discussed is "The Bookseller's Secret" by Michelle Gable, which is set in 1940s London during the Blitz. The novel follows a young woman who becomes entangled in the world of publishing and the secrets of a famous writer, offering a fresh perspective on the challenges faced by women in the literary industry during that time period.