Cirrus@Austlit

'If the Seventine are released, will anyone survive? The possession of Abigail’s mate has left their melding bond in tatters. But she has no time to grieve. The deadline still looms to collect the half-Walkers. Together with her friends she ventures to Crais, the red land of the two suns. From the moment they step into the scorching heat, they’re surrounded by rock and death. And with limited time and oxygen they will have no second chance to figure out the secret to this planet’s survival. And then, when she thinks all hope is lost, the Seventine make her an offer she can’t resist. But will her chance to save Brace be the catalyst that destroys the worlds?'

Source: Publisher's blurb.