DARQ: Complete Edition

In chapter 5, after you do the rotating maze puzzle where the screen spins around and you can get the "off camera" achievement, to the left is the lighter. Before grabbing the lighter and continuing through the level, use the right door to walk up the wall and across the ceiling to get to the journal. If the door is open you can use the lever next to it to close it.

If you are going back and collecting any journals you missed with chapter select, you do not have to finish the level to save it. You can immediately quit to the menu / choose a new chapter after picking it up.