Fin And Fever. Undertow Sins, #12

"The ocean doesn't forgive. It just decides how long to let you believe you're swimming."Ondine March is a determined undercover marine biologist investigating a ruthless live-capture shark trafficking network in the Gulf of Mexico. But when her cover is blown 180 miles from the nearest coastline, she isn't thrown overboard. Instead, Colton Stryker, the heavily scarred and meticulously controlled captain of the Mako Doctrine, zip-ties her in the stifling, diesel-scented cargo hold alongside three captive sharks-including a massive, pregnant bull shark.
To Colt, Ondine is a massive liability. But when a brutal tropical storm named Isaura bears down on the vessel, the hold floods, and Ondine contracts a deadly, escalating bacterial fever from the contaminated bilge water. As the storm ravages the boat and the line between life and death narrows, the power dynamic begins to invert. Colt soon realizes he needs her scientific expertise to keep his valuable cargo alive-and more terrifyingly, he realizes he refuses to let her die.
Trapped together in a perilous fight against violent weather, failing boat mechanics, and a fierce, undeniable attraction, their adversarial relationship morphs into a consuming connection. But Colt has federal secrets of his own, and surviving the storm is only the beginning.