Here is a freeSherlock Holmes - The Speckled Band by Arthur Conan Doyle (Пестрая Лента - Артур конан Дойль), Russian graded reading book aimed at elementary level. You can find the PDF [here]. It’s pretty short but it comes with vocabulary lists, and questions on the text to assess your comprehension.
There’s also a free audio playlist reading this out, so it’s a great way to get some listening practice in also. You can find the Youtube playlist [here].