Discover the unforgettable finale to Ali Smith's dazzling literary tour-de-forceIn the present, Sacha knows the world's in trouble. Her brother Robert just is trouble. Their mother and father are having trouble.

Meanwhile the world's in meltdown - and the real meltdown hasn't even started yet. In the past, a lovely summer. A different brother and sister know they're living on borrowed time.

This is a story about people on the brink of change. They're family, but they think they're strangers. So: where does family begin? And what do people who think they've got nothing in common have in common?Summer.

'Smith's seasonal quartet of novels is a bold and brilliant experiment' Independent'The novel's hopeful message about the healing power of friendship ensures the quartet ends on a feel-good note' Sunday Times