The last universe

From their isolated house, fourteen-year-old Susan and her wheelchair-bound brother, Gary, venture daily into the tangled, sprawling garden planted by their late uncle and tended by a mysterious gardener. Overgrown with impossibly large plants and exotic flowers, the garden holds at its heart a hedge maze that hides a quantum secret, outside the laws of the macro world. And Susan and Gary may not return from the labyrinth unchanged.