The Big O " Bring back my Ghost"

In this episode, Roger Smith is hired by a wealthy woman, Melissa Fraser, to find her son, Bonnie, before her birthday. However, Bonnie is believed to be dead, having died in a land dispute riot a year prior. Roger discovers that the deaths of several Military Police officers, including Bonnie, are connected to a ghostly figure seen near the Hudson River during foggy nights, and that these officers were involved in corrupt land acquisitions.