I first saw this film on the Television and I was absolutely stunned at the time I saw it and from what I saw. It should be noted that this drama is based on the novel by Nicci French.
From the DVD cover:

"Trauma psychologist Samantha Graham is asked to shelter a teenage girl whose parents have been brutally murdered. Recently moved from London to the country with her own young daughter, Sam reluctantly agrees, but quickly finds herself caught up in the mystery and danger surrounding her new charge. Soon her lover is dead, her career is threatened and her daughter in jeopardy as Sam fights to discover the truth and to regain control".

This drama is like a perfectly blended cocktail. Suspense, mystery, entanglement and murder rolled in to a good classic. The music accommodates the atmosphere nicely and you really empathize with the characters. Everything is in danger and nothing is at all what it seems...