Douglas Fairbanks, Jr., Presents S05 E13 Bulldog Drummond and 'The Ludlow Affair'

Bulldog Drummond is contacted by a Mrs Harriet Ludlow, wife of an old friend; her husband has invented a new antibiotic formula potentially worth a fortune, but he has been kidnapped and held for ransom. Drummond sets out to prevent the formula from reaching the hands of the villains -- with or without his client's co-operation!