Akira Hamada is driven by past failure. Two years earlier, she had a chance to kill her greatest enemy-Kaito Mitsui. Instead, the Yakuza boss forced her to become an assassin in his employ. Now Akira carries out the bloody business of the notorious crime syndicate and hates herself more each day.

When Mitsui hears that his sister's murderer will be on the cruise ship Starfish, he immediately tasks Akira with eliminating the man once and for all. This is what Akira has trained for, but a series of strange events on the ship tests her resolve and shows her a way to redemption.

Devon Lyons, on the other hand, has nothing to do with assassins. He's merely accompanying his aunt and uncle, Sara and Paul Lyons, on a free cruise.

Little does he know that the two are the true targets of the charming Japanese tourist he has just met! Akira knows that either Sara or Paul is the killer but doesn't know which one. She hopes seducing the handsome Devon will lead to better intel, but she is surprised to find herself trusting him. And soon, the pair finds themselves fighting for their lives on the high seas.