mind and
spirit from his own shell--into that of others--Madame Sin--Chichester.
Now his body lies here empty! If I killed that----"

Exotically beautiful dark eyes--with death in their loveliness--watched
him from the library doorway as he bent over the red-robed figure.
Sardonic death in lovely eyes!

"No wonder Gest thought that Wilson was killed in the conference room,
just before he could tell of the roulette wheel, as if Doctor Satan had
been there himself! Satan _was_ there! And he was on the roof garden
earlier, and in the roulette room! A trance for the woman, the crowding
of Satan's black spirit into her body--and she becomes Madame Sin, with
Satan peering from her eyes and moving in her mantle of flesh! A trance
for the unfortunate Chichester--and Satan talks with Gest and Kroner as
the Blue Bay treasurer, and can strike down Wilson when he comes to
report! Chichester and Madame Sin--both Doctor Satan--becoming lifeless,
trance-held shells when Satan's soul has left them!"

But here was Satan's physical shell, lying in a coma at his feet, to be
killed at a stroke! His deadly enemy, the enemy of all mankind,
delivered helpless to him!

"But if I do kill the body," Keane whispered, "will I kill the spirit
too, or banish it from the material world so that humanity won't again
be troubled? Satan's spirit, the essential man, is abroad in another
body. If I kill this red-robed body, will it draw the spirit out of
mortal affairs with it? Or would it simply deprive it of its original
housing so that I'd have to seek Satan's soul in body after body, as I
have till now sought him in the flesh in lair after lair? That would
be--horrible!"

He drove away the grim thought. It was probable that with the death of
his body, Doctor Satan in entirety would die, or at least pass out of
mortal knowledge through the gateway called death. And the mechanics of
forcing him through that gateway was to kill the body.

Behind him, Madame Sin crept closer and closer on soundless feet. Her
red lips were set in a still smile. The gold-link purse was extended a
little toward Keane. Her forefinger searched for the movable bar that
changed angles of the queer, metal cage within.

Keane's hand raised to strike. His eyes burned down at the red-clad
figure of the man at his feet, who was mankind's enemy. Behind him,
Madame Sin's finger found the little bar....

It was not till then that Keane felt the psychic difference caused by
the