the Vanishing. the original from Holland in 1988, where it was known as Spoorloos:
Rex and Saskia, a young couple in love, are on vacation. They stop at a busy service station and Saskia is abducted. After three years and no sign of Saskia, Rex begins receiving letters from the abductor.
Spoorloos (1988)
there was a fail remake by Hollywood in 1993
The Vanishing (1993)
with Jeff Bridges & Kiefer, but it isnt half as good.