Mastermind by Andrew Mayne

Dr. Theo Cray and FBI agent Jessica Blackwood confront a cataclysmic conspiracy in a pulse-quickening thriller by the Wall Street Journal bestselling author of The Naturalist.
A mysterious electrical storm plunges Manhattan into darkness. As a strange, smothering fog rolls in, all communication crashes. In the blink of an eye, the island seems to vanish into a void.
FBI special agent Jessica Blackwood and brilliant scientist Dr. Theo Cray know this isn't a freak accident. It's a sinister sleight of hand. Their greatest adversary, a serial killer and cultist known as the Warlock, has escaped during a prison transfer in New York. A depraved master of manipulation, he promised the end of days. He's making good on it.
One by one, cities across the globe are erupting in chaos as they disappear into the same black holes. Even for two ingenious trackers like Jessica and Theo, there's still so much to learn about the pattern to the Warlock's madness. The voids are just a warm-up for something bigger. To discover it-to stop it-Jessica and Theo must descend into the darkest of shadows-and minds.

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