Armlet

The armlet sisters, Kolina and Sofia are given by their dying grandmother is more than a piece of jewellery. It has been handed down through the family for countess generations.
Kolina places the armlet on and is connected to Eboff, an advanced computer with news that she is the descendant of a starship crew that crashed on the planet a millennium before. Only when other ancestors of this crew are found that technology far superior to that now known on the planet can be accessed to save the world from nuclear annihilation.

Their journey travels through strange fog that they later realise causes necessary time jumps in their search. Natalie an orphan from their past finds them and they travel back to the present to rescue, Alan, a wounded soldier on the front line. These two also have armlets but a final armlet one proves more elusive for it has been stolen and used by an enemy spy.

But is it too late? Their world is at war and the nuclear holocaust has already begun.