X THE SECOND MURDER

XI THE RUSSIAN BANK-NOTES

XII THE THIRD MURDER

XIII AMBLER APPLEYARD

XIV FIFTY THOUSAND POUNDS REWARD

XV THE BAYSWATER BOARDING-HOUSE

XVI MR. GERALD RAYNER

XVII THE PHOTOGRAPH

XVIII DEFINITE SUSPICION

XIX THE LATE CALL

XX NUMBER FIFTY-THREE

XXI THE YOUNG MAN WHO LED PUGS

XXII THICK FOG

XXIII THE POSSIBLE DEATH WARRANT

XXIV CONCERNING CARL FEDERMAN