Bioshock Infinite Issue

[Darth Payne]

I've just now found the third Vox Code Book, i find the Bank Of The Prophet...

Only to find the door leading further into the Bank barred...

So my questions are...

When, Where and How do i finish the last code?

[Samuel Dravis]

Continue with the story and you'll have to pass through the bank. It will be unlocked then. Not the most straightforward thing, I had a time of it myself with that one.

[Darth Payne]

That does explain some things, as there was a gate in the graveyard that i had to light two torches to open... and i thought there might be a hidden switch to find there as well...