Break In: Diamond Heist [Outdoor]

You are a team of diamond thieves, the best in the business; and you have been on the hunt for the world renowned "Master Diamond" for quite some time. After spending years on the hunt for it, you finally have traced it down to a city; and have worked out the information as to who the handler of the diamond is. Your plan: eliminate the handler; take his place, then locate and steal the diamond...what could possibly go wrong?