Dan was on his way to the station with a woman when suddenly they both collapse. They're brought to the hospital. Sam and Jim show up and learn that they were poisoned and that unless they know what they were poisoned with, they don't have much time. They learn that the woman went to the station and was saying that her life was being threatened and wouldn't say anything else. Dan brought her home and somehow convinced her to file a report. He was bringing her when they collapsed. Sam and Jim go to her apartment and see that they had coffee. So they take everything to be analyzed but there was no trace left. So they go to where she works and they learn that she spends time at a beach house. They go there and find a boy breaking in. They question him and he says that his father leased the house and that he and the woman are having a thing. They question the man and they learn he's a chemist and he could have access to the poison but he denies poisoning her. Sam comes up with a plan to ...