Waves - Sharon Dogar

For fifteen-year-old Hal Ditton and his family, summer has always
meant six glorious weeks by the sea. But this year is different
- Charley, Hal's sister, is lying in a coma. When the troubled family
makes the difficult decision to return to their holiday home
without her, Hal finds it harder than anyone to shake off his elder
sister's presence. In fact, Hal's mind is crowded with thoughts
of Charley, and the events that led to her accident on the beach
last summer - thoughts which, he comes to realise, are not entirely
his own.