The Empty Cab

The Fourth Witness

A Blind Bargain

Sisters of Eve

The Mysterious Mr. Tiller

The Winged Mystery

The Phantom's Secret

The Circular Staircase

Love Without Question

A Scarlet Week-End

At the Sign of the Jack'O Lantern

The Conspiracy

The Flashlight

The Social Code

The Scarab Murder Case

File 113

The Blood Seedling

Unknown Treasures

The Two-Soul Woman

Chains of Evidence