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Is it possible to kill an immortal creature? A wild unicorn that lives forever or dies forever? Who is capable of such a thing? And most importantly, why kill wild unicorns? Yes, Skander and his quartet are no longer pupils, they are kids now. But their second year in the Nest begins with the gruesome murder of a wild unicorn. Of course, suspicion immediately falls on Skander, the first clergyman in decades. And the old bard's prophecy adds to the panic, foretelling of evil "born of the power of the spirit."

It's a wonder that anyone would side with Skander, if the most famous family of saddlers or the Peregrine Society, the coolest of the Nest's societies, can be considered "anyone." There are more training sessions ahead, culminating in a jousting tournament for the kids, which will result in the six weakest being kicked out of the Nest. Meanwhile, the wild ones continue to be killed...

Skander and his friends realise that these murders are part of some evil plan. It seems that the Island itself is taking revenge for the destruction of the immortals by devastating natural disasters. Can the quartet of kids stop the deaths? Will they be able to save the Island? And if only they could avoid being expelled from the second year and stay in the Nest for the next year!