After finishing Koontz's rather good The Silent Corner, I started "Dark Matter" by Michelle Paver.
I think I picked this up after someone had recommended Blake Crouch's sci-fi novel of the same name, I saw it on a charity stall and grabbed it not realising that it wasn't the book that I thought it was, d'oh! About 50 pages in, written in the format of a journal, so far, so good
Edit : forgot to add that once I figured out that this wasn't Blake's novel, I looked on Amazon and picked up the right one for 99p on kindle! They also have Tremblay's Head Full of Ghosts on for 99p too, is that worth picking up?