Ok I am in Hermes real and have found 4 books boon less limbs,delving punchers,gnashing blades, and prying orbs. I have made it to chapter 5 where there are those places to put the 5 black books which I only have 4. I think the one I need is in chapter 1 but I can't get any doors to open anyone know where I can find the last book?

ask a mod to move this to the spoiler forum.

Did not know it was up well since it can a mod please move this for me.