John Broughton 
Angenga [EPUB ebook] 
The Disappearance Of Time

When Rick Hughes receives a relic as a gift from an old friend, he has no idea what he’s getting himself into. Drawn to an old excavation site, Rick stumbles upon a portal that takes him back to the 8th century, in the middle of a Viking invasion.
After discovering a shocking link to the present, Rick is determined to intervene and save the village from devastation – and to find a scientific explanation for what is happening.
With the perils of 8th century England surrounding him, can Rick save his new friends and live to tell the tale?