Tried searching for several words but not sure if the words were correct.
Details are a bit fuzzy. MC ends up in a house. Maybe inherited it. House had lower level. Somehow, he discovers that he has visitors living downstairs who've been there for years. I believe a large vault door protects the inhabitants.
Visitors are aliens and have tunnels where they live and have workshops. They also go outside at night and hunt game to eat which puts has local game warden searching for them.
For some reason, one of the three leaders, who is in suspended animation/stasis has to be revived to answer a question.
Thanks in advance.