Odessa Sea by Clive Cussler and Dirk Cussler (2016)

TL;DR: A Dutch Industrialist wanting revenge against Russian leadership sets up a terrorism attempt against the US using a previously submerged Soviet Atomic Bomb. Dirk Pitt and team are compelled to stop this. Dirk Jr. and Summer gets tangled with Russian Intelligence leading to a Russian Imperial Treasure, Romanov Gold. This went fast. Initially thought there were only two entities or story lines. Spoiler: There are three. The pace has the feel of a Sherlock Holmes/Tom Clancy mix while still having that James Bond/Indiana Jones-vibe for the seas and oceans. The Dirk Pitt series has this tendency of mixing contemporary news with historical issues.The fiction starts at the seams where history is deemed to be unfulfilled. The product is one fine craft of action and adventure. Longer summary: More Spoilers