Diomede Islands. For three months each year, you can walk from the USA to Russia across an ice bridge-a frozen path known as the Ice Curtain. In 1963, when the body of a young woman is discovered on this icy no-man's land, the already fragile relationship between the superpowers threatens to collapse. With nuclear tensions rising, an FBI agent and a KGB operative must solve the murder-before the ice melts-and war ignites.