Symbol: Peach
Peaches are symbolic of Georgia, the state in which the novel is set, as well as Reacher's vitality.
Symbol: Greyhound Bus
The Greyhound bus that Reacher rides on is symbolic of Reacher's itinerant lifestyle.
Allegory: Jack Reacher
Jack Reacher's story, as told in Killing Floor, is an allegory for the knight errant, which told the story of a knight who wanders around, searching for a situation in which he can prove his chivalry.
Motif: Reacher Starting Fights
A fairly common motive in the novel is Reacher starting fights with bad people so he can prove his chivalry.
Motif: The Corrupting Influence of Money
Money as a corrupting influence is a fairly common motif - specifically as it relates to the Kliner family, who are corrupt and debase themselves to get additional money.
