Doctor Satan, the World's Weirdest Villain—the classic 1930's pulp character created for Weird Tales magazine—has finally been brought to justice. A fantastic prison, from which escape is impossible, has been built to permanently incarcerate the master of dark science and black magic, but criminologist Ascott Keane remains wary. He knows Doctor Satan will not submit quietly to judgment, but even Keane is caught off-guard when the diabolical villain turns the tables. Caught in a trap of his own devising, can Keane win his freedom, or will he forever remain the Prisoner?