At an extravagent costume ball a jewel heist goes horribly wrong. The five-year-old son of the wealthy Greene family dissapears, is presumed dead, and all fingers point to BOSTON BLACKIE as the main suspect. The body is never found, and seven years later BB is still haunted by what happened that night. He's drawn back into the case, and finds that his memory and the truth of what happened that night lay deep and distorted in a watery grave.