Attorney Joshua Scranton hires "Budge" Edwards and Larry Donovan, who has just bought into Edwards' detective agency, to protect Estelle Hudson, a client of his who is to inherit three-million dollars the next Thursday. He tells them he has reason to believe the girl is in danger from five relatives who stand to benefit by her death. Helen Bradford, Edwards' secretary, with who Larry is in love, insists upon impersonating the endangered heiress. Edwards acts as her chauffeur and Larry as her fiancé whom she met in Europe. Scranton provides a reliable maid, Jeannie Martin, to accompany Helen. Lobo the Marvel dog , Edwards' police dog, goes along as added protection. The relatives, assembled at the Hudson country home, are Aunt Catherine, a crabby dowager; Sarah , her bitter, unmarried daughter; Cousin Ellwood, a simple, good-natured drunk cousin; and the heiress' uncle, Dr. Silas Hudson, who is an archery expert.