Wiretapper

Jim Vaus, U.S. Army electronics expert becomes involved with gangsters. His wife begs him to quit but he's become too useful, discovering wiretaps, setting up alarm systems and even saving a mobster's life by diffusing a time bomb. Gang-member Tony urges Jim to invent a device to tap lines carrying race results and delay them so they could make big money on post-race betting. After Tony is killed by a fellow mobster, Alice persuades Jim to attend a tent meeting held by evangelist Billy Graham.