Robert B. Parker's Slow Burn

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Two years after a fire, still haunted by the death of his friends, firefighter McGee takes the case to Spenser. Spenser quickly learns not only that McGee might be right, but that the fire might be linked to a deadly string of new arsons. As Spenser deals with some tough personal issues, he follows the trail of fires through a mire of corruption and greed while everyone wonders where the firebug will strike next.