It was wrong of you to buy the book. You should have gotten it as an ebook. Then you could have just hid your iPad in your bag.
S*** there is a Kindle edition and it’s cheaper than the physical book. What have I done??!!!
Then again I do have a personal rule against using my MacBook Pro or my iPad on the train. It’s those maniacs drinking hot cups of coffee (you never know when they don’t have a firm grip).