Broken Compass is an Adventure Role-Playing Game inspired by the great movies and games of the genre, from the Mummy to Uncharted, passing through Indiana Jones and Tomb Raider.
This is one of those setups where you have to have some understanding for the killer. Unwanted visitors are annoying on their own, but here are thousands of them all the time. It doesn't excuse the killings, but anyone would be grumpy.