A knight's destiny spells the end for Portents.

In the final days of Camelot, Merlin foresaw a great darkness rising. He dispatched five knights to combat this evil—and safeguard the world from its insidious threat. The knights built a fail-safe device, should all hope fade, and awaited the day it became necessary.

The clock starts ticking when a prominent philanthropist is found murdered. Detective Samantha Myers, with the aid of a centuries-old siren Thel, is pulled into the case. Stymied by the secrets uncovered, Myers turns to the only man capable of solving the mystery: Greg Loren.

In the absence of Soriya Greystone, Loren has taken up the role of protector in Portents. He feels inadequate to handle the burden though, especially when he learns his new partner, Gabe, is spiraling at school and with his foster family.

The case proves the perfect distraction as Loren confronts the deadly guardians of the knights. As each key falls into the hands of the murderous Squire, Merlin's prophecy is on the verge of becoming a reality.

Can Loren protect the last knight and the key he bears or will Portents fall in the wake of his failure?

The restoration of Portents may be over before it has even begun in this epic installment to the Greystone Saga.