High-octane thrillers are rare in juvenile literature, but Watt Key has a reputation as a transcendent novelist, and he uses his talent for all it's worth in Deep Water. Twelve-year-old Julie Sims has an ominous feeling the day she and her father, who runs a dive shop, take a client out on the waters off the coast of Gulf Shores, Alabama. Her father is a seasoned divemaster and has taught Julie much of what he knows, but he isn't feeling well today, and that's no good for diving. The client is Hank Jordan, a businessman interested in exploring a pair of military tanks Julie's father towed out to sea a while ago and let sink a hundred feet below the surface. Submerged vehicles morph into artificial reefs over time, havens for aquatic wildlife. The tanks promise to be a fertile fishing spot, which is why Mr. Jordan paid four times the usual rate for this dive. The cash influx could save Mr. Sims's dive shop, but Julie has mixed feelings. Not only is her father ill, but Mr. Jordan doesn't seem disposed to listen to instructions, and that's dangerous when you're heading a hundred feet underwater. His son Shane, a schoolmate of Julie's before her parents divorced and she moved with her mother to live in Atlanta most of the time, also resents instruction. At the last minute Mr. Sims bows out of leading the expedition for health reasons, and asks Julie to take the Jordans down. She's never led a dive and doubts Mr. Jordan and Shane will take her seriously, but Julie is in better shape to do this than her father, and he desperately needs the money. She suits up and readies for the plunge.
Below the waves is a dim, surreal world. Sunlight fades as Julie and the Jordans near the seafloor and set anchor for their return trip. Julie's oxygen supply should last well beyond the twenty minutes scheduled for fishing, and the Jordans have "pony" tanks to stay longer if they choose, but from the moment the anchor touches down, Julie senses danger. Up top the current was swift, but she hoped it would be calm a hundred feet down. No such luck: the currents push back on Julie as she moves between the tanks while monitoring the Jordans, forcing her to use oxygen at an elevated rate. The Jordans pay their young divemaster no mind, busy spearing fish in and around the tanks. When Julie checks her oxygen, she panics: it's time to start surfacing immediately, and she'll have to rush. That means risking the bends, nitrogen bubbles in the blood vessels that can inflict permanent paralysis. Leaving Shane and his father to surface when they wish, Julie gropes for the anchor...but it's gone. Without it the current will drag her at a frightening pace away from the boat. Julie swims up through inky blackness toward the surface, conserving oxygen as best she can, and drinks in the sweet air when her head breaches. Now the real trouble begins: the boat is nowhere in sight.
Shane and Mr. Jordan surface nearby, disoriented and scared. Shane isn't hurt, but his father came up too rapidly. Judging from the blood trickling out of his nose and mouth, he has the bends. He can't feel his arms or legs, a sign that his condition is severe, but he, Shane, and Julie all wear BCD flotation vests. The sky is murky and gray, the water rough, waves cresting so high that Julie and her companions must work to keep their heads above water. Julie is aware of the threats to their lives: sharks inevitably taking interest in a trio of half-submerged humans; the lightning storm in the distance that Julie prays isn't moving toward them; the current carrying them out to blue water, over the line between the gulf waters and the ocean, where monstrous fish hunt. Hypothermia may be the most imminent threat of all. Julie can only hope the BCD vests hold out until her father finds them. In waters this vast, the odds are grim.
The scene feels eerily real and immediate, the panorama of a huge sky over your head and opaque water from horizon to horizon, concealing predators as terrible as imagination can conjure. Who knows what killers are inches from your toes, thinking of taking a bite? Julie can't let her mind go there, natural as it is to obsess on what she can't see beneath the waves. She and Shane have to focus on keeping Mr. Jordan conscious. Julie immediately discarded the string of fish he surfaced with, which would attract sharks in no time, but his bleeding mouth and nose will lure any shark in the vicinity. The nightmare goes more extreme as rumbling storm clouds migrate directly overhead, lightning wildly stabbing at the sea in a deafening game of Russian roulette. The bolts briefly render the water transparent, showing hordes of jellyfish all around, and if lightning hits close enough, Julie and the Jordans will be dead.
But there's more in store for Julie, Shane, and Mr. Jordan. Julie can't prevent them from drifting into blue water, but she urges them to swim past the dividing line quickly. They want no part of the aggressive beasts that roam these waters for fresh meat. The appearance of sharks is a matter of when, not if, yet Julie still feels visceral horror when a school of them starts circling in the water, drawn by Mr. Jordan's blood. The sharks are curious, but are they bold enough to take a bite? Julie's father warned her for years that sharks maim and murder without conscience, and her survival may hinge on whether she can defend herself against the initial strike. The longer Julie is stranded in open water, the more her odds of survival drop, but her seaborne odyssey has miles to go before the window for rescue cracks the slightest bit. What can two shellshocked kids and a paralyzed man do against Mother Nature's full rage? And are they about to drift into new perils that will make them beg for a fast death?
Watt Key's storytelling is smooth, atmospheric, and packed with thrills. It takes talent to evoke the fear of even a setting as scary as the deep sea. Deep Water had me feeling like I was in the water beside Julie dreading what horror could be sneaking up on me next. There's substance to the narrative, too. We feel Julie's heartbreak over her parents' divorce a few years back, the dissolution of the core relationship in her life. When her mother had enough of her father's eccentric lifestyle and left, Julie saw how it damaged him. He needs his dreams, but he needs Julie and her mother just as much. Early in the book Julie and Shane are at odds, his attitude grating on her. Why does he think being a rich kid grants him license to ignore her instructions as divemaster? Shane and Mr. Jordan's behavior at the dive site contributed to the crisis that followed, and Julie isn't shy about saying so. But catastrophe shapes us in unforeseeable ways, as Julie finds out bobbing on the cold waves beside Shane for days. "Now it seemed there was no difference between me and Shane. He was a boy and I was a girl, but mostly we'd been reduced to two people simply staying alive. And right there, at that moment, he was the most important person in the world to me. I couldn't think of anything worse than losing him and being alone. And just the day before I'd hated him with all my heart." Surviving a perilous world beside someone you didn't like at all before? That changes a relationship. You don't let go of the person who stands between you and utter aloneness, the final link to a tolerable life...even if theirs is the last hand you ever grasp.
Deep Water could be more thematically substantive, but it's far from superficial, and the story's freewheeling energy makes up for any lack of philosophical complexity. Watt Key had me turning pages at a good clip, and I cared about Julie and Shane on a human level. They're fully formed characters, believable as people and as kids, and that's no mean feat for an author. Deep Water builds and maintains suspense without gore or other objectionable content for young readers, and I wouldn't have been surprised had it won something from the 2019 Newbery awards committee. I enjoyed every minute of this book.