Paramount's first all-talking picture, Interference was dismally directed by Roy Pomeroy, whose lofty status as the studio's "technical wizard" did not necessarily qualify him to be a director. Evelyn Brent heads the cast as scheming Deborah Kane, who sets out to blackmail Faith Marley (Doris Kenyon), the above-reproach wife of Sir John Marlay.
Bobbie Morton is a gutsy heroine in the grand Australian tradition. She's a champion horsewoman who can hold her own amongst the men of the racecourse. As part of her adventures she must come to the bottom of a secret race-rigging scam, as well as fend off the advances of an amorous squatter.
A radio commentator named Perry Travis fancies himself a brilliant amateur detective. The cops wish he’d stick to his microphone and let them do the detecting. This proves impossible when a famed scientist is murdered in Perry’s studio, right in the middle of the interview. All evidence points to Perry, and he sets out to clear his name before the Shadow-like villain roaming the hallways of the radio station gets away with murder.
In Victorian England, Florence Nightingale's heroic measures slowly change the attitude towards nurses when it was considered a disreputable profession.