The Candlelight Heist

It seems someone forgot to invite the cities best thief to their birthday party. Fortunately for him, he knows where they are keeping the cake for the party. A little bit of breaking and entering should be all it takes to get himself a slice of cake. 

The cake is kept in a locked vault in the back of the mansion. One of the guards should have a key if you can't fine one elsewhere. Try to make it out with some extra loot too.