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For Aloysius Tucker, taking his nine-year-old cousin Maria sledding is all about frozen toes and hot coffee in the warming house. It shouldn't involve chasing after Maria as she's led into a long black car by a stranger in a Bruins jacket. But by the end of the crisp December morning Maria is gone, her mother is dead, and her father—mafia don Sal—has been arrested for murder.

Sensing blood in the water, would-be successors to Sal's criminal empire square off, agreeing on nothing but the ide...