The Klae Corporation requests Dan's help in determining whether a wealthy recluse is still alive and planning to make a corporate deal with a foreign government.

When priceless paintings are stolen from the Capitol building in Washington, D.C., Dan and Kate are asked to infiltrate a foreign embassy to find the perpetrators.

Dan and Kate attempt to expose a phony spiritualist who has been exerting undue influence over a powerful senator.

The Westins must prevent a suspected spy from being assassinated before they find out how she has been stealing documents, and to whom she has been selling them.

At a scientific conference in Stockholm, Dan must determine whether a former defector is sincere in his request for help to escape back to the U.S.