Dolly Levi is a strong-willed matchmaker who travels to Yonkers, New York in order to see the miserly "well-known unmarried half-a-millionaire" Horace Vandergelder. In doing so, she convinces his niece, his niece's intended, and Horace's two clerks to travel to New York City.
The handsome top agent Matt dies a tragic death in his bath tub - the women mourn about the loss. However it's just faked for his latest top-secret mission: He shall find Dr. Solaris, inventor of the Helium laser beam, powerful enough to destroy a whole continent. It seems Dr. Solaris has been kidnapped by a criminal organization. The trace leads to the Cote D'Azur.
Matt Helm is called out of retirement to stop the evil Big O organization who plan to explode an atomic bomb over Alamagordo, NM, and start WW III.