The biggest challenge Joe Pentreath was expecting was moving up to secondary school, and he had the whole summer holiday to get ready for that. Yet when he sights four galleons heading for his home village of Mousehole in Cornwall, he's in for a dangerous adventure he cannot walk away from.Only old Tom Tregenza seems to know what's going on and only Joe's headmaster, Mr Pender, can tell Joe what the past has in store for his future. Old Tom has a secret, a grief he doesn't like to talk about, yet Joe must get to the bottom of it with only his best friends, Billie and Zack, to help.The Spanish Armada are bringing fire, sword and sacrilege to England. Can Joe and his friends really travel back in time to 1595 and stop King Philip's men making an example of Mousehole?