The book continues the adventure of Jonas Taylor, a paleobiologist studying the megalodon, who now discovers another prehistoric monster, Kronosaurus, also thought to have been extinct.

The shark, named Angel, has grown into a 72 ft (22 m), 31 t (68,000 lb) monster who draws crowds from all over the world to get a glimpse of its incredible size.

Jonas, plagued by nightmares where he and Terry die in the Trench, refuses the request, insisting that he remain at the institute to determine what damage Angel is doing to the steel doors keeping her in the lagoon.

After receiving news of the attack, Masao and Celeste return to Monterey to handle the fallout while Terry remains aboard the Goliath to finish the accident report.

Back in Monterey, Jonas and Mac finally examine the gates and realize that Angel's head on collisions have nearly destroyed the hinges.

While recuperating at the hospital, Jonas realizes that Angel is ovulating, explaining her more aggressive nature and the male great whites swimming outside the lagoon doors.

While analyzing the sonar records, Terry realizes that the tapes have been edited, but submits a report saying the sub went down due to pilot error, knowing it's her only hope of Singer letting her off the Benthos.

However, after netting Tootie, Angel closes in and eats her, disabling the trawler's winch, which also causes the helicopter Mac and Jonas are in to crash.

Back onboard the Benthos, the mysterious creatures grow more bold in their attacks, disabling the Prometheus' engines after the sub unearths an immense fossil from the ocean floor.

Heath inspects the fossil and discovers it is a subspecies of Kronosaurus, a marine reptile that has escaped extinction and the same creatures that are attacking the Prometheus and destroyed the Proteus.

Securing the doors, Terry enters the hangar control room and starts flooding the chamber killing Sergei.

Unfortunately, this results in a Kronosaurus swimming into the hangar to feed on Sergei's corpse and erasing any hopes of Terry's to steal the Epimetheus and escape.

Mac takes to the air in his helicopter while Jonas is towed in a life raft ahead of the bait and uses underwater speakers to ensure Angel appears.

Suddenly his raft stops in the water, the line having been cut by someone Mac sees rushing back inside the ship.

Jonas finds out he momentarily died on the operating table and decides he is done with megalodons, refusing Celeste's pleas to rejoin the hunt saying Angel is too big to recapture and wanting to start life anew with Terry.

Maren pleads his case, admitting to removing the firing pin from the rifle, but insists he didn't cut the rope, revealing he was sleeping with Celeste at the time.

An earthquake has made Jonas realize that Angel hasn't been following the whales, she's been using the Pacific Rim to navigate her way back to the Mariana Trench in order to breed.

Finally determined to figure out what exactly Singer is up to, Terry uses Sergei's keycard to access the high security laboratory aboard the Benthos.

Having arrived in the Devil's Purgatory, Singer sends the Epimetheus into the Trench to dig for the nodules, Terry joining the trek.

The Kronosaurs continue attacking, denting the hull of the Epimetheus enough to cause it to implode and the docking station to lose pressure killing several of the crew.

Singer orders the Benthos to ascend into the cold waters above, out of reach of the Kronosaurs, but the creatures attack the habitat's ballast tanks stranding it on the sea floor.

Using locks of her hair, she fashions a disguise of sideburns and a mustache and makes her way to the docking station planning to hide in the bathroom utility closet.

She leaves him tied to the chair in front of the window baiting in one of the Kronosaurs who attacks and destroys the glass killing itself and Benedict in the process.

Jonas and Terry are able to pry open the control room doors enough for her to slip inside and start the flooding process again.

[2] British director Ben Wheatley was announced to direct in October 2020,[3] with Statham stating in April 2021 that filming would begin in 2022.