The Legend of Viking Thunder
by M.G. Leonard 
 
Sim's Uncle Emmett is missing and on the run from the ruthless Council of Keys.

Sim and his cousin Jeopardy are determined to find him. Their search takes them through a hidden door in time to Viking Norway and a desperate mission across land and sea to stop the legendary Gjallarhorn – said to herald Ragnarök, the end of the world – from falling into the wrong hands. The Legend of Viking Thunder can be read as a stand-alone novel, or enjoyed as part of the thrilling Time Keys series written by M.

G. Leonard.
 
Macmillan
paperback Sep 2025 9781035005987
288 pages
KS2