Jordan's Crossing by Randall Arthur

When pastor Jordan Rau accepted a position with a European missions agency, his decision was based on money, not on an opportunity to serve God. However, shortly after his family's arrival in Germany, Jordan's priorities dramatically change - his young son, Chase, has been murdered. Abandoning his faith in God, Jordan becomes obsessed with finding Chase's killers and delivering justice. He sets out on a course of action that will destroy not only the murderers, but his own family as well - and only a miracle can stop him.