Henry Trotter is a unicorn while her best friend is a teenage girl who learns that she is part of the Homo Magica race, humans who can also perform magic. One day the odd pair find an ancient amulet that changes both of their lives forever.

As more falling stars pass through the world’s atmosphere, it is proven that not even the alicorn sisters have it within their power to stop them. The probability that one will strike somewhere, perhaps even somepony important, becomes evident.