Isabel Ostrander

   At One-Thirty (1915)
   Crevice (1915)
   The Primal Law (1915)
   The Heritage Of Cain (1916)
   The Clue in the Air (1917)
   The Fifth Ace (1918) (as by Douglas Grant)
     aka The Red Glove
   Island of Intrigue (1918)
   Suspense (1918)
   Ashes to Ashes (1919)
   Booty (1919) (as by Douglas Grant)
   The Second Bullet (1919) (as by Robert Orr Chipperfield)
   The Single Track (1919) (as by Douglas Grant)
   The Twenty-Six Clues (1919)
   Anything Once (1920) (as by Douglas Grant)
   How Many Cards? (1920)
   The Man Who Convicted Himself (1920) (as by David Fox)
   Unseen Hands (1920) (as by Robert Orr Chipperfield)
   The Crimson Blotter (1921)
   The Man in the Jury Box (1921) (as by Robert Orr Chipperfield)
   The Trigger of Conscience (1921) (as by Robert Orr Chipperfield)
   Ethel Opens the Door (1922) (as by David Fox)
   McCarty, Incog (1922)
   The Tattooed Arm (1922)
   Above Suspicion (1923) (as by Robert Orr Chipperfield)
   The Doom Dealer (1923) (as by David Fox)
   Annihilation (1924)
   Bright Lights (1924) (as by Robert Orr Chipperfield)
   Dust to Dust (1924)
   Liberation (1924)
     aka Impulse
   The Black Joker (1925)
   The Handwriting on the Wall (1925) (as by David Fox)
   The Neglected Clue (1925)
   The Mathematics of Guilt (1926)
   The Sleeping Cat (1926)
   The Sleeping Cop (1927)
     aka The Braddigan Murder