The Spring of Souls. The Dream Defenders, #3

When a vengeful dreamer threatens the soul of every dreamer on the planet, can the Dream Defenders locate an ancient dreamscape in time to foil her plan? Nolan's first few months at the DREAM Institute have been anything but normal, and that trend continues when an annual contest takes center stage. The Hero's Hunt, a fierce competition designed to test the skills of their most talented dreamers, offers up prestige and prize money to the winner, but when outside forces interfere in the competition, the entire organization is left reeling. A rogue dreamer-a woman familiar to Nolan-has come seeking revenge for past wrongs.
Fueled by vengeance, this dreamer will stop at nothing to bring the Institute to its knees. Her threats lead them on a chase through the dream world, pointing them toward an ancient dreamscape responsible for ensuring the safety of every dreamer on the planet. The only problem: this dreamscape has been lost for centuries. Finding what is lost is never easy, especially when it is something never intended to be found.
To do so, Nolan faces impossible choices, and he must decide how much he is willing to sacrifice to protect the slumbering souls of humanity.