Cover art information provided by Internet speculative fiction database. Issued (inverted) with: Hierarchies by John T. Phillifent. Novels. "First Ace printing: May, 1973"--Title page verso.
Summary:
Mister Justice: A time-traveling vigilante named Mister Justice is striking at criminals. The authorities can't allow this to continue, so they train super genius Daniel Jordan to catch Mister Justice. Meanwhile, another time-traveler, Aurthur Bingle, starts to take over the world. Hierarchies: Sixx and Lowry are to take the Crown Stones of Power to Earth to be studied. Their cover is that they're escorting a young lady with an eidetic memory and one of the royal pets.
Series:
Ace double ; 53415
Indexed by:
Reginald, R. Science fiction, 11530
OCLC:
(OCoLC)1704730
Locations:
OVUX522 -- University of Iowa Libraries (Iowa City)
This resource is supported by the Institute of Museum and Library Services under the provisions of the Library Services and Technology Act as administered by State Library of Iowa.