You can read Kindle books on the iPad via an app, but Apple Books don't work on the Kindle. Both support many other document formats, like Word and PDF and Audible audiobooks (via an app on the iPad).
I share my review of the Musketeers vs. Cthulhu adventure from Nightfall Games. Designed for Call of Cthulhu, the four chapter tale takes the players to 17th century during the era of Alexandre ...