Welcome to the thread Improbable and all other new members :)
For anyone new who isn't clear on how this thread works - it's a challenge to read 50 books in 2015. You can still join even if you don't think you'll get to 50 - just record what you've read and say what you thought of it (a short review so we know what it's about and whether you recommend it or not). Some of us are also on Goodreads and record our books on there too.
There are no reading rules, unless you wish to set them for yourself. Any book can be recorded and be included in the 50 Book Challenge. So that can be novels, non-fiction, children's books, YA, plays, poetry, short stories, audio books, re-reads. All reading is good reading :)
And there is no rule that, once you've got to 50 (or not), that you have to drop out of the thread. A lot of us reached 50 books during the year, and continued recording them (I'm a chronic reader, and recorded over 100 books last year!)