I've thought about the Rats a bit.
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Do all the missions [3] for (with) the Arnika rogue (Myles) first. You get a diamond to give to the bank for a reward. Later the road rat (Rattus) gives you the bank note and gun. You rob bank and get diamond back to sell. Finally, the mob rats (The Godfather and his Thug) are supposed to be killed by you, but only after you've explored the Swamp and discovered something (fake). Bad, bad rats.

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You get a diamond to give to the bank for a reward. Later the road rat (Rattus) gives you the bank note and gun. You rob bank and get diamond back to sell.
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good call, I never thought about that. I guess ambition and evilness are separated by a very thin line