Cold Service (Spenser #32) by Robert B. Parker
Used mass market paperback (cover may vary).
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When his closest ally, Hawk, is beaten and left for dead while protecting a bookie, Spenser embarks on an epic journey to rehabilitate his best pal, body and soul. But that means infiltrating a ruthless mob--and redefining his friendship with Hawk in the name of vengeance...
"Cold Service moves with the speed of light."--Orlando Sentinel