Blue Blood, by Edward Conlon (Riverhead, $27, www.amazon.com.

Bangkok 8, By John Burdett (Vintage, $13, www.amazon.com.

One is a nonfiction account of a cop-turned-detective in the New York City Police Department. The other is a best-selling murder mystery that takes place in Thailand. Two continents, two crime-stoppers, two page-turners.