The sequel to the hugely popular Echogenesis. Fifty years on from the previous expedition, the crew of another lander has arrived on Aranyani and made their home on a high mesa isolated from the surrounding forest. There, they can be safe from the deadly Howlers - or so they think. But Sam can't help wondering if his changes to the Tsiolkovsky's programming have really worked. He believes his will be the final expedition - but what if he's wrong? And even as he ponders, his son, Gramm, is busy exploring the coast of Aranyani's largest continent, more than a thousand kilometres away - where he makes a shocking discovery that upends everything his father has come to believe.

The third and final volume in the Echogenesis series. Sam and the rest of his small colony, vastly outnumbered by the warlike Howlers, must find a way to cope with the revelation of their discoveries, far to the west of the mesa. The means to end the war in humanity's favour lies in Sam's grasp - but it may also spell their doom.