Every day in Washington, DC, the blue-and-gold 1st Helicopter Squadron, code-named ÒMUSSEL,Ó flies over the Potomac River. As obvious as the presidential motorcade, the squadron is assumed by most people to be a travel perk for VIPs. TheyÕre only half right: while the helicopters do provide transport, the unit exists to evacuate high-ranking officials in the event of a terrorist or nuclear attack on the capital. In the event of an attack, select officials would be whisked by helicopters to a ring of secret bunkers around Washington, even as ordinary citizens are left to fend for themselves. For sixty years, the US government has been developing secret Doomsday plans to protect itself, and the multibillion-dollar Continuity of Government (COG) program takes numerous formsÑfrom its plans to evacuate the Liberty Bell from Philadelphia and our most precious documents from the National Archives to the plans to launch nuclear missiles from a Boeing 747 jet flying high over Nebraska. In Raven Rock, Garrett Graff sheds light on the inner workings of the 650-acre compound (called Raven Rock) just miles from Camp David, as well as dozens of other bunkers the government built its top leaders during the Cold War, from the White House lawn to Cheyenne Mountain in Colorado to Palm Beach, Florida, and the secret plans that would have kicked in after a Cold War nuclear attack to round up foreigners and dissidents, and nationalize industries. Equal parts a presidential, military, and political history, Raven Rock tracks the evolution of the governmentÕs plans and the threats of global war from the dawn of the nuclear era through the present day. Relying upon thousands of pages of once-classified documents, as well as original interviews and visits to former and current COG facilities, Graff brings readers through the back channels of government to understand exactly what is at stake if our nation is attacked, and how weÕre prepared to respond if it is.