If you like history, try the Non-Fiction Series on World War II and the electric train. These books are less than 30 pages with many endnotes, so if you want to do more research, you can. Now, available in ebook, paperback and audio!
Click on the books to go directly to the Amazon page or find them on my Books2Read author page. https://books2read.com/ap/8pBDOR/Lorri-Moulton