It's useless to discuss the case further until you've familiarized yourself with them." As they left Headquarters for their homes, the three men realized that despite the many developments of the case, they had, as yet, barely penetrated the surface.

Every new discovery had only succeeded in adding further complications to the mystery.

The evidence thus far was fragmentary, disconnected, throwing an uncertain light on the crime.

The substitution of prisoners tended to involve Beard, yet it gave not the least hint of the motive that actuated the killing of Whitmore.

Nor did it reveal how the crime was committed.