On a world that has never known night, the coming eclipse will spark a fight for survival—and expose the truth buried in its own shadow.

Their sun has never set—until now.

When the Mintaka discovers a moon orbiting his world, it may spell doom for all radiants: an eclipse that will last for millennia. But when his warnings are met with resistance, he must fight not only to prove the eclipse is real, but to convince the radiants to prepare for it. As rival families turn against one another, old loyalties fracture and new alliances form.

Adham is a teacher caught between the family he left behind and the one that has taken him in. When he is given an ancient journal to decipher, what begins as an intriguing task may hold the key to surviving the coming eclipse.

Nox is born beneath the threat of extinction. When tragedy tears her from her family, she is forced to find another—only to discover that survival may mean becoming a pawn in a conflict she barely understands.

As the shadow draws near, who will stand beneath the fading light—and who will survive to see what waits beyond?

For readers of N. K. Jemisin and Adrian Tchaikovsky, The Radiants is the first book in the Heliopaides saga—an epic tale of a civilisation built on sunlight, and the darkness waiting to reclaim it.