One of Them, by Alan Orloff (epub/Kindle)
When Daniel Brickman returns home to visit his ailing father, he discovers that an old family friend has bilked his father out of his entire retirement savings. His first thought? Call the cops. But Daniel’s vengeful father would rather handle things on his own than let the whole world know about this Jew-on-Jew crime, and it falls on Daniel to try to set things right before everything goes very wrong.