Rendezvous With Danger
Pemberton, Margaret
Original title: The Girl Who Knew Too Much.

It began beautifully - a holiday away from the tourist crowds, a revelling in the lovely countryside of Bavaria.  But then Susan Carter's dream was rudely shattered by the crash of a speeding car!

If only Susan hadn't recognized the photograph of the car said to have been used by assassins!  If only she weren't in a position to identify them!

Two men were quickly upon the scene to help her - an Englishman, Stephen Maitland, and a fair-haired, good-looking German, Gunther Cliburn.  They were so kind, so helpful - surely she could trust them.  But gradually for Susan life takes on the horror of a nightmare.  The tangled web is closing in, and Susan doesn't know which, if either, of her rescuers to trust...