"An unusually warm winter day resulted in 2.3 million gallons of molasses flooding the North End neighborhood of Boston, Massachusetts. The disaster killed 21 people and injured 150 others. Rescue missions were launched to save people from the sticky and deadly mess, led by the Red Cross, the army, the navy, and the Massachusetts Nautical School. With the help of hundreds of volunteers over the course of several weeks, the streets were cleaned up....

In South Boston, the Massachusetts State Police are waging a war on Irish-American organized crime. Undercover cop Billy Costigan is assigned to infiltrate the mob syndicate, which is run by gangland chief Frank Costello. Billy quickly gains Costello's confidence. Colin Sullivan is a hardened young criminal who has infiltrated the police department as an informer for the syndicate. Colin is rising to a position of power within the Special Investigation...

Chronicles the January 15, 1919 Boston Molasses Flood that killed twenty-one people when over two million gallons of molasses poured out of the steel tank that stored it and traveled through the city's North End

Jane and Maura investigate a number of complex and troublesome cases, including a deadly shooting at a community parade, the brutal killing of an overzealous journalism student, and the pending murder trial of Maura's biological father, Paddy Doyle.

Parker once again proves he is a force of nature in this mystery where a hurricane hinders a kidnapping and Spenser goes on a search for the man responsible--the infamous Gray Man, who has both helped and hunted Spenser in the past.