The steel lever was down, the point of the cutlass touching the floor. Therefore they were both compelled to step over the death-trap in order to leave the remarkable apartment.

Then with careful hands Charlie tried the next door. It was locked.

Brief examination showed it to be the door of the back drawing-room, which had been thrown into the larger room with the mysterious purpose of constructing that striking rural interior.

So they crossed to the third door, on the opposite side of the landing, and, with greatest caution lest another pitfall should lurk there, opened it.

That night of investigation was full of surprises.

The instant Max flashed on his light the pair drew back with low exclamations of horror.

The small apartment was unfurnished. It contained only one object—gruesome and unexpected. In the centre of the place, upon the black trestles, stood a coffin of polished oak with shining electro handles and fittings.

The lid, they noticed, was screwed down. Was it possible that it contained an unburied corpse. Did that white-enamelled door upon the stairs conceal from the world the evidence of a crime?

For a moment both men stood in that bare, uncarpeted room, rooted to the spot.

The secret of Sam Statham stood revealed.