What are the motifs in New York Dead by Stuart Woods?

Friendship is a motif that runs through the novel, though at times it is the lack of friendship that becomes the focus.

Stone Barrington is friends with his partner of four years, Dino Bacchetti. The two detectives are close, and Dino at one point refers to Stone as "a brother." Though there are many differences between the two men, their upbringing being the most obvious, they mesh well as partners and friends. An example of their friendship on the job and off is the fact that Stone is recovering from a gunshot he received in the line of duty. Though the injury is painful, it would have been much worse had Dino not killed the suspect that had fired the shot.