If anyone gives it a shot we have a small bug to be wary of. So when examining Lewis' desk on your second visit to YogsTower make sure to examine the piece of paper on the desk rather than the crowbar at the bottom otherwise you will be locked out of presenting a crucial piece of evidence and wont be able to make it to the finale. Hope it doesn't cause folk too much trouble!
There is also a spoiler-lite walkthrough towards the bottom of the page if you find yourself stuck!