Margaret O'Mara's brother disappeared decades ago. But now that his last known associate has just been found dead, O'Mara hires PI Paul Whelan to investigate. Whelan makes the rounds through seedy bars and dilapidated apartment buildings, discovering connections to a long-gone Chicago amusement park that was once the site of another murder. Soon, Whelan is navigating his way through dark pasts, deep secrets, and a mystery that may cost him his life....