The Transcendent Tide — Doug Johnstone

It's been eighteen months since the Enceladons escaped the clutches of the American military intent on exterminating the peaceful alien creatures. Lennox and Vonnie have been lying low in the Scottish Highlands, Ava has been caring for her young daughter Chloe, and Heather is adjusting to her new life with Sandy and the other Enceladons in the Arctic Ocean, off the coast of Greenland. But fate is about to bring them together again for one last battle. When Lennox and Vonnie are visited by Karl Jensen, a Norwegian billionaire intent on making contact with the Encelaldons again, they are wary of subjecting the aliens to further dangers. But when word arrives that Ava's daughter has suffered an attack and might die without urgent help, they reluctantly make the trip to Greenland. It's not long before they're drawn into a complex web of lies, deceit and death.