The Au Pair by Emma Rous

A young girl escaping a bad situation at home finds herself in a worse one when she signs on to become an au pair to a young well-off couple in a remote beach house estate off the English coast. Laura truly loves being with the little boy, Edwin and gets along well with his parents but then secrets lead to more secrets which lead to tragedy. Years later, after the death of their father, Edwin and his twin brother and sister begin to puzzle over what actually happened the night the twins were born and their mother threw herself off the cliff. As they press people for more information, the threats begin and all those secrets start unraveling. Dark and sinister with secrets as sharp and ragged as the coastal cliffs, you will be compelled to race through to the wow, yet tidy ending.