At 3:33 a.m., for exactly 33 seconds, a mysterious green glow appears in the sky, forever changing the life of marine biologist Skye Martin.
Moments later, she is attacked and dragged underwater by a creature unlike anything she has ever seen. When she resurfaces, she discovers that she is an Echo-bound to an ancient supernatural force and destined to reincarnate through her ancestors. Skye gains the ability to manipulate the void at will, though using it comes at a dangerous cost.
As she struggles to understand what happened after the glow, she crosses paths with former Marine Alex O'Connor, who has also been granted powers by the phenomenon. Though he is far from fond of human connections, he reluctantly agrees to help her. Together, they search for answers, their bond unraveling into a whirlwind of love and conflict.
But Helios Nova Enterprises, a secret organization, knows exactly what happened. They know that, according to an ancient prophecy, one of the Five Flames will bring hell to Earth.
Marked as a threat, Skye and Alex are relentlessly hunted-until they realize that the truth is far more complex than they ever imagined.