Stranger in the night a Haven novel

In the dead of night, there's a knock on the door at Haven, an inner-city youth center in St. Louis. A refugee family--scared, tired and hungry--seeks shelter. Fresh back from Afghanistan, former marine sergeant Joshua Duff takes on the mission. He recruits aid worker Liz Wallace, but she has questions for Joshua. Such as why a Texan with an oil magnate for a father is working at Haven. Or why a man who fears nothing--including the gang violence...