Somewhere in the Highlands — Beth Trissel

The MacDonalds are coming! When Elizabeth MacDonald (a.k.a Beezus Mac) thrusts a sealed gold box at Angus Fergus amid panicked requests for him to hide the stolen artifact, she has no idea the ancient cloth it contains bestows unearthly powers. Red MacDonald knows and he's hell-bent on traveling 400 years into the future to claim the charmed relic, even kill for it.
Protecting Beezus from his old nemesis is only one of Fergus's problems. Before they can stop him, Morley MacDonald, descendant of Red MacDonald, snatches the prize and leaps through the time portal to head the MacDonald clan and kill Fergus's MacKenzie ancestor. If he succeeds, Fergus will cease to exist.

Danger grows in the feud between the MacDonalds and the MacKenzies as the pair, along with an ingenious friend and high tech inventions, returns to 1604 Scotland to face these brawny Highlanders and reunite with kin. Will Fergus overcome his mistrust of Beezus and fan the growing spark between them before they battle Morley? If he waits, it may be too late.