In his remote, mountainous base, Chris Calloway learns the hard way about the resilient nature of the Blue, as his war machines' plan of attack against them doesn't go exactly as planned. Aspen and Chance - and their new captive prisoner - have plans of their own as they attempt to free Aspen's brother Finn. Meanwhile, Siphon begins to ponder a course of action below the surface that could lead to disastrous results for the citizens of Muria. And if that's not enough, the Black reveal the massive scope of their attack - one which all of mankind might not survive! The deadly tides of change rise above the surface as the exciting third volume of the best selling action adventure series, Fathom continues!