Cover credits confirmed from Julius Schwartz' editorial records, provided by DC Comics.
Inside front cover. Contents and indicia.
Credits for script, pencils and inks confirmed from Julius Schwartz's editorial records, provided by DC Comics.
A mouse escapes from a cage in research assistant Paul Jonas's lab, and leads him to a magic book that can alter the future. He uses the book to his advantage, but the mouse inadvertently causes his death by chewing parts of the pages away, which changes the words written in the book.
identification of cover characters (outlines, no drawings)
Inside back cover.
Back cover. Staff members are identified inside.