Pog and the King's Armour

Peregrin Otis Grimshaw (Pog) has a problem.
He's almost ten and has to spend his holiday at his grandmother's cottage.
No wifi and no phone - living without any of life's gadgets is bad, but things get worse when he accidentally releases an evil force unlocking the secret that Gran really isn't who he thought she was.
Falling through to the alternative world of Twistedwood, Pog finds himself in a land where playing games is not just a way of life, it is life.
Having stuck his nose where it shouldn't be, Pog now must fulfil a prophecy, rescue his kidnapped grandmother and save both worlds from a crazy ruler intent on conquest.