I could begin with a lark stitched into a letter. It’s 2020 and ‘all manner of virulent things’ are simmering. Sixteen-year-old Sacha writes to Hero, a detained refugee. She wants to send ‘an open horizon’. Unsure what to say to someone suffering injustice, she writes about swifts: how far they travel, how they feed – and even sleep – on the wing. The way their presence announces the beginning and ending of summer ‘makes swifts a bit like a flying message in a bottle’. Maybe they even make summer happen.

Ali Smith is a formally and thematically exuberant writer who takes obvious pleasure in the art of storytelling, the mutability of language, and slippages in representation ...