Clickers III by J.F. Gonzalez and Brian Keene

They thought it was over, but the second wave was only the beginning. In the aftermath of the Clickers and Dark Ones' siege and a coup against an insane President, America rebuilds. Change has come, and a better future is promised to all. But promises can be broken and there may be no future at all because deep beneath the ocean, a new terror awaits. Dagon, god of the Dark Ones, is waking up...and if humanity doesn't stop him, then mankind will face extinction. Trapped on a South Pacific Island, the cast of Clickers and Clickers 2: The Next Wave join forces with a mysterious group of occult agents to face off against the Clickers, the Dark Ones, Dagon and an all-new threat-the deadly obsidian Clickers. The stakes have never been higher. Dagon is rising... and humanity will fall. Clickers III: Dagon Rising-It's more giant monster carnage and B-movie fun as only J. F. Gonzalez and Brian Keene can bring you.