The Obsidian Chamber by Lincoln Child

A Tragic Disappearance
After a harrowing otherworldly confrontation on the shores of Exmouth, Massachusetts, Special Agent A.X.L. Pendergast is missing, presumed dead.
A Shocking Return
Sick with grief, Pendergast's ward, Constance, retreats to her chambers beneath the family mansion at 891 Riverside Drive - only to be taken captive by a shadowy figure from the past.
An International Manhunt
Proctor, Pendergast's longtime bodyguard, springs to action, chasing Constance's kidnapper through cities, across oceans, and into wastelands unknown.
But in a World of Black and White, Nothing Is as It Seems
And by the time Proctor discovers the truth, a terrifying engine has stirred - and it may already be too late....

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