4 ideas
Wyatt, a professional armed robber, carefully plans a robbery in Melbourne. The job goes wrong because people he worked with betray him, and he spends the rest of the story tracking the double-crossers to settle accounts and recover what he is owed. It is a case of meticulous preparation defeated by the one variable planning cannot control: the loyalty of partners.
In a well-planned crime, the external risks of guards, locks and police can be mapped and managed. Partners cannot, because each carries private motives such as greed, desire or grievance that the plan never accounts for. So the real threat to an operation is usually inside the team, not outside it.
Treat the professional criminal as a tradesman: someone who scouts, prepares and prices risk, and who keeps emotional attachments to a minimum because attachments create leverage and error. From this angle, the amateurs around him fail through impulse and appetite, not lack of nerve. Detachment works as an operating method rather than a personality trait.
Money that is itself illegitimate, such as kickbacks, bribes or undeclared cash, is an attractive target because its owners cannot call the police or sue to get it back. That same lack of recourse governs relations among thieves: when a partner steals from you, the only enforcement available is personal retaliation. Outside the law, every agreement rests on the credible threat of consequences.