Do Not Disturb (movie, 1999)

Combining a family vacation with business, Walter Richmond takes his wife and their 10-year-old, mute daughter, Melissa , to the Netherlands -- where Melissa inadvertently witnesses a murder. Unable to tell anyone what she's seen, the frightened girl vanishes in an attempt to elude the killers. Meanwhile, her parents try desperately to piece together the puzzle leading to Melissa's disappearance.