On the tranquil shores of Crystal Bay on the tropical island of Koh Samui, a woman's body floats to shore on the afternoon tide. Unnoticed, she drifts close to the many tourists taking advantage of the tepid water to try to cool down in the hot mid-afternoon sun. She is naked except for a Buddhist amulet around one of her wrists and a silk scarf tied tightly around her neck and she has distinctive Sak Yant tattoos down her back. It looked like a straightforward case of a bar girl taking the wrong customer home for the night until a phone call to the police station from an expat husband in Bangkok saying that his wife a high-profile prosecutor had not been answering her phone since the previous evening and that he had contacted the management at their holiday home on the island to check on her when he had entered the house he found an overturned coffee table drops of blood on the broken glass but no sign of his wife.

After the woman's body is identified as the missing prosecutor, it comes to light that she was building a case against a Russian drug cartel boss operating out of Phuket with links to the Asian underworld.

When pressure from the upper echelons of the Thai government works its way down to the police minister, he contacts Colonel Chief Superintendent Saetang and demands that he make a quick arrest. Knowing that his best investigator had been banished to Koh Phangan, Colonel Saetang recalls Lieutenant Chai Son Sinuan from his exile back to Koh Samui to try to solve the case.

as too late as Astrid was already running through the water towards the sand and her parents screaming at the top of her lungs about a dead lady in the sea.