Lennox is a troubled teenager with no family. Ava is eight months pregnant and fleeing her abusive husband. Heather is a grieving mother and cancer sufferer. They don't know each other, but when a meteor streaks over Edinburgh, all three suffer instant, catastrophic strokes - only to wake up the following day in hospital, miraculously recovered. When news reaches them of an octopus-like creature washed up on the shore near where the meteor came to earth, Lennox senses that some extra-terrestrial force is at play. With the help of Ava, Heather and a journalist, Ewan, he rescues the creature they call 'Sandy' and goes on the run. But they aren't the only ones with an interest in the alien - close behind are Ava's husband, the police and a government unit who wants to capture the creature, at all costs. And Sandy's arrival may have implications beyond anything anyone could imagine.