Ian McEwan "The Cement Garden"

I am a fan of Ian McEwan. "The Cement Garden" is very disturbing book.
Four childeren, of whom first the father dies and shortly after that their mother. And because they don't want to be separated and live in an orphanage, they decide to hide their death. To keep the mother's death a secret, the two oldest children, a girl and a boy bury her in their garden, cementing over her grave with a bag of cement.
The rest of the story focuses on how the children act when there are no parents.
Tanya.