VI The Detectaphone

VII The Green Curse

VIII The Mummy Case

IX The Elixir of Life

X The Toxin of Death

XI The Opium Joint

XII The "Dope Trust"

XIII The Kleptomaniac

XIV The Crimeometer

XV The Vampire

XVI The Blood Test

XVII The Bomb Maker

XVIII The "Coke" Fiend

XIX The Submarine Mystery

XX The Wireless Detector