Text ( visual ) : unmediated High time for heroes / by Mary Pope Osborne ; illustrated by Sal Murdocca. -- : pbk. -- New York : Random House , c2016. -- 118 p. : ill. ; 20 cm. -- (Magic tree house ; #51 . a Merlin mission ; A stepping stone book). -- ISBN 9780307980526 ; (BB20781992) ; https://ci.nii.ac.jp/ncid/BB20781992 Author Heading(s): Osborne, Mary Pope ; Murdocca, Sal. -- Classification(s): DC23 : 813.6. -- Subject Heading(s): LCSH : Nightingale, Florence, 1820-1910 -- Juvenile fiction ; LCSH : Children's stories