Seventeen-year-old Jess wakes from an emergency heart transplant to discover she's being haunted by the disgruntled ghost of her donor - teenage socialite, Tilly. And she won't leave Jess in peace until they unravel the mystery surrounding her death. Their investigations take them deep into Tilly's luxurious heiress life - from private schools to Swiss banks and high-end hotels. But the clues lead somewhere darker than either of the girls could have imagined. And if Jess can't solve the murder in time, her own life may be at risk...