Born into a family of flying trapeze artists, Olympia Knife has one small problem: When her emotions rise, she becomes invisible. Everyone in the traveling circus has learned to live with this quirk; they banded together to raise Olympia in a loving environment when her parents vanished midair during their act, never to return. But the same fate befalls Arnold, the world's shortest man, followed by one act after another, until the show is a crumbling mess of tattered tents and terrified troupers. Into this chaos walks Diamond the Danger Eater. Olympia and Diamond forge a friendship, then fall in love, and, together, resolve to stand the test of time, even as the world around them falls apart.