Dulcie’s old boyfriend, the adventurous, fun-loving, and decidedly good-looking Brendan MacArthur, reappears with a unique gift: a very old bottle of wine, one of several that he found in a shipwreck while scuba diving in Maine’s cold Atlantic waters. With museum attendance low during a particularly brutal winter, Dulcie knows exactly what to do. The museum will host a wine tasting as a fundraiser featuring this old vintage. But when an icebreaker busts through the pack ice in Portland harbor the day after the festivities, the crew makes a gruesome discovery. Someone from the party didn’t make it home, and instead wound up among the bobbing gray-blue sheets of ice floating from one side of the harbor to the other.

Dulcie’s knowledge of wine is needed by detective Nicholas Black as he sorts through the details of this case, but their budding relationship is also put to the test. Brendan MacArthur’s sudden reappearance irritates Nick. Does he ignore his feelings and chalk them up to simple jealousy, or is there something else far more dangerous about this Brendan MacArthur that Dulcie and Nick have yet to discover?