Each chapter costs approx 130 coins, you can earn tickets by watching up to 3 ads a day each worth about 18 and by logging in and claiming a daily reward, first time you get a decent amount but any time after that you recieve next to nothing. In order to finish 1 book you would have to spend a ridiculous amount of money. Not worth it, go to Waterstons and pick up a book from there, it would cost less. Alternatively shell out £7.99 for kindle unlimited and have an endless supply of books.