Here’s what’s new in bookstores this week:• The Prince of Risk by Christopher Reich (Doubleday, $25.95) — The bestselling author ( Rules of Betrayal) has a degree in international economics and worked as a stockbroker before getting his MBA at Texas. In this financial thriller, Bobby Astor is a hotshot hedge-fund manager whose father, the chairman of the New York Stock Exchange, is murdered (along with other financial big shots) on the South Lawn of the White House.