Sister - Rosamund Lupton

Their bond was unbreakable. The truth was unimaginable.

When Beatrice gets a frantic call in the middle of Sunday lunch to say that her younger sister Tess is missing, she boards the first flight home to London. But as she learns about the circumstances surrounding Tess’s disappearance, she is stunned to discover how little she actually knows of her sister’s life – and unprepared for the terrifying truths she must now face.

The police, Beatrice’s fiancé and even their mother accept they have lost Tess, but Beatrice refuses to give up on her. So she embarks on a dangerous journey to discover the truth, no matter the cost.