Every spring, birds small enough to fit in the palm of your hand fly two thousand miles north to lay their eggs. This is the story of one tiny hummingbird's amazing journey.

"Our planet is always turning. It may be midnight in London, but in different time zones other living things are waking up, ready to hunt or feed or fight. As the clock strikes twelve, two sisters are spirited away on a journey to glimpse, in the span of a moment, extraordinary biodiversity: a mother polar bear and her cubs hunting seals in Svalbard, tiny turtles in India following the moon toward the sea, and enormous whale sharks gulping plankton...