The Andalusian Connection. A Rhys Taylor Story, #12

In 1968, a Soviet ballistic-missile submarine vanished into the Pacific with nuclear weapons still aboard. Officially, the wreck of K-129 became another Cold War ghost story-until someone starts killing ships in the same waters, with no distress calls and no survivors. When a U. S. Navy research vessel is destroyed near the long-lost wreck site, Rhys Taylor is pulled from his hard-won quiet life into an operation that feels bigger-and darker-than anything he's faced.
Alongside his trusted friend Digger Graves and marine geophysicist Dr. Elena Martínez, Taylor heads into the deep aboard a covert research ship, only to discover something impossible: weaponized underwater drones guarding the graveyard of K-129. The evidence points to Triton Dynamics and a Spanish financier with ties to a shadow syndicate known as La Hermandad. What begins as salvage turns into a race to stop nuclear material from being recovered, refined, and sold to the highest bidder.
From the crushing pressure of the ocean floor to the olive groves of Granada, Taylor must expose the truth-before an old Cold War relic sparks a modern catastrophe.