Chin goes to his 25th high school reunion. While there a woman whom he hasn't seen in 25 years is killed when someone was chasing her and threw her down some stairs. Steve and Danny go to Cambodia to check the lead he learned about his family and finds practically nothing so he goes back to Hawaii and helps Chin with the investigation. They learn the woman brought nearly 200 k with her, but she didn't have it on her. They learn she used the money to pay a woman's hospital bills. They talk to the woman and she says she doesn't know her. But they find a photo of her with the woman's son who disappeared 25 years ago. They wonder if his disappearance has something to do with her death.