Tom Clancy's Op-Center: Dark Zone

In Dark Zone, a race-to-the-finish thriller in the New York Times bestselling Tom Clancy's Op-Center series, the brutal murder of an undercover agent reveals a plot to incite a full-fledged war between Russia and Ukraine.

Former US Ambassador to the Ukraine Douglas Flannery meets with an old friend and former spy near New York's South Street Seaport. She is seeking his help to thwart a Russian plan to overrun her native Ukraine, but those for whom she is working propose an infinitely more da...