When Harper Proulx and her newfound sibiling travel to Hawaii to track down their sperm donor father, Harper finds a deep-sea diver obsessed with solving the mystery of a shipwreck and the experience forces her to face even bigger questions.

Brodie McFadden is supposed to be on vacation, getting some sunshine and deciding if he wants to join his brothers and the Krewe of Hunters, a special paranormal investigation unit of the FBI. But a diving excursion with an old navy buddy to a historic shipwreck uncovers a crime scene - and the corpse is new. Museum curator Dakota "Kody" McCoy just wants her Key West culture festival to succeed. She's always had a deep connection to her home, including...

"Jay Gardiner has given himself a fool's errand--to find the remains of his deceased father in the Pacific Ocean off the coast of Monastery Beach. He knows it's a long shot, but Jay feels it's the only way for him to lift the weight of guilt he has carried since his dad's death by suicide the previous year. The dive begins well enough, but the sudden appearance of a giant squid puts Jay in very real jeopardy, made infinitely worse by the arrival of...

Despite her fatal allergy to sunlight, XP, and the risk to all she holds dear, Allie Kim is determined to see Garrett Tabor brought to justice and may get her chance when she and Rob uncover a horrible secret Tabor has hidden under Lake Superior.

It's been five years since Elsie's twin brother Eddie drowned in the North Sea. Now she's sixteen, and doing whatever she can to cope with the heaviness and void left behind. And when she meets Tay, a freediver, Elsie finds herself back in the waters that took her brother's life, confronting truths about herself and her family.

When Fable and the Marigold's crew become pawns in a notorious thug's scheme, Fable delves into a world of deception and betrayal, risking everything to secure her and the crew's feedom.

Beverly gets into serious trouble when her starvation diet interferes with her scuba diving.

Kaz, Dante, Adriana, and Star think they will be studying marine life this summer, but they find sunken treasure.

David Taylor, the twenty-one-year-old son of Jonas Taylor, agrees to escort two of Angel's litter to Dubai, where a royal prince is building the largest aquarium in the world, unaware that he is being set up to lead an expedition into the dangerous Panthalassa ocean hidden beneath the Philippine Sea Plate.

Unable to sleep, seventeen-year-old competitive diver Ingrid, who is recovering from a head injury, and her neighbor, former best friend, and forever crush Van spend their nights together, unraveling the secrets in their quiet cul-de-sac.