Dravor,
That is not Lovis' storehouse, but Lt. Louis'. You can only gain access to it if you complete "Band of Brutes" in a certain way.
There are some "walk-through"'s available for free-- you can do a search here for "walkthrough" and follow those links.
Have fun w/ this great game!
![hehe hehe](/images/graemlins/default_dark/tada.gif)
Hope this info helped you!
~~CierraShore