Bela and Lizzy, the dominant megalodon siblings from Angel's brood, have escaped the Tanaka Institute to roam the Salish Sea in British Columbia. While Jonas Taylor and his friend Mac attempt to either recapture or kill the "sisters," Jonas' son, David, embarks on his own adventure, motivated by revenge. Having witnessed his girlfriend's gruesome death, David has joined a Dubai prince's ocean expedition, tracking the 120-foot, hundred-ton Liopleurodon that escaped from the Panthalassa Sea.

Tanaka Institute, Monterey, CA: Angel, the recaptured 76-foot, 100,000-pound Megalodon, has birthed a litter of pups - five females - far too numerous and aggressive to keep in one pen. One solution: a Dubai royal prince is building the largest aquarium in the world and seeks to purchase two of the "runts". The deal hinges on hiring Jonas Taylor's 21-year-old son, David, to be their trainer. Jonas reluctantly agrees, and David is off to Dubai for the summer of his life.

Its appetite is ravenous. Its teeth scalpel-sharp. Its power unstoppable as it smashes the steel doors holding it in a Monterey, California, aquarium. The captive 20-ton Megalodon shark has tasted human blood, and it wants more.

Book six in the best-selling Meg series picks up after Meg: Nightstalkers with David Taylor in the Salish sea, attempting to locate and rescue any surviving Megalodon pups before a local fisherman slaughters them. Meanwhile, Jonas is coerced into joining an expedition into the Panthalassa sea in search of a prehistoric predatory species possessing liver enzymes that can cure cancer.

Loch Ness holds secrets, ancient and deadly. Does a monster inhabit its depths, or is it just myth? Why, after thousands of reported sightings and dozens of expeditions, is there still no hard evidence? Marine biologist Zachary Wallace knows, but the shock of his near-drowning as a child on Loch Ness have buried all memories of the incident. Now, a near-death experience suffered while on expedition in the Sargasso Sea has caused these long-forgotten memories to resurface.