I read Love Simon (Simon vs. The Homo Sapiens Agenda), before going to see the film this coming weekend. Whichever way round you do it, the mystery will be spoilt, and do try not to see anything showing the ending of the film! I had, which gave me a big clue. But it doesn’t really matter. The book is definitely a teenage/young adult novel, nicely written and very enjoyable once I’d worked out who all the characters were. And I'm looking forward to the film.