San Francisco, 1952. Detective Evander "Andy" Mills has started a new life for himself as a private detective-but his business hasn't exactly taken off. It turns out that word spreads fast when you have a bad reputation, and no one in the queer community trusts him enough to ask an ex-cop for help.

When James, an old flame from the war who had mysteriously disappeared, arrives in his offices above the Ruby, Andy wants to kick him out. But the job seems to be a simple case of blackmail, and Andy's debts are piling up. He agrees to investigate, despite everything it stirs up.

The case will take him back to the shadowy, closeted world of the Navy, and then out into the gay bars of the city, where the past rises up to meet him, like the swell of the ocean under a warship. Missing people, violent strangers, and scandalous photos that could destroy lives are a whirlpool around him, and Andy better make sense of it all before someone pulls him under for good.