Archie and the Normandy Assignment — John Murray

Teenager Sean Murphy's granddad is a retired scientist who has worked on top secret projects for the US government.But the government doesn't know about Archie - his own personal secret project - and he hopes to keep it that way. After Sean accidentally discovers that Archie is a time portal, he and his friend see a golden opportunity to complete a difficult World War Two school history assignment by watching events as they actually unfold.Embarking on the greatest and most dangerous adventure they've ever experienced, they manage to uncover a grave injustice that has remained hidden for decades. But in order to reveal the truth, they must survive long enough to make it back home in one piece...