Jani and the Great Pursuit

Jani and her stalwart companions, Lieutenant Alfie Littlebody and
Anand Doshi, find themselves chased from India, via Greece, to London by
the British authorities, Russian spies and a Hindu priest - who all
want what Jani carries, the ventha-di: the key that will open the door
to other worlds. In London she attempts to rescue the imprisoned alien
Mahran - the only person who might help her save the Earth from the
invasion of the merciless Zhell, the self-styled Masters of the Cosmos.

But will she escape London and reach Tibet before the forces of evil
capture her - and before she is betrayed by someone she considers loyal
to her cause?