America's entry into World War II affected almost everybody, including retired jewel thief Michael Lanyard, aka the Lone Wolf! After numerous light-hearted adventures, this thrilling entry dials down the comedy somewhat as Lanyard - along with his faithful valet, Jamison - finds himself in bomb-ravaged London, having to track down Nazi agents as well clear himself for yet another crime he didn't commit. The incomparable Warren William and Eric Blore are as delightful as ever, while the dumb cop roles are taken over by Thurston Hall and Fred Kelsey. Also on hand are Hillary Brooke, Forrest Tucker, Billy Bevan and a young Lloyd Bridges, all under the sturdy direction of the renowned Edward Dmytryk (The Caine Mutiny).