Months after mysterious corals drew 99% of humanity into the sea, a band of survivors ekes out a hollow existence on a remote British island. When two people are cast up on the beach, completely blue, but very much alive, the island is thrown into turmoil. What is the secret behind the mass extinction event…and will this pair of altered humans prove our salvation - or our undoing?! Lastly, and most importantly, what is the coral, what does it want with the Earth…and what does it have to do with a man who went missing, shortly before the Sea-Sickness hit?