The Assassins by Gayle Lynds is a thriller where six international assassins, each assembled from a dark corner of the globe, team up together to steal a fortune from the middle of a Middle Eastern war zone (available June 30, 2015).
Assassins. Six of them, to be precise, get the story rolling from the blood-streaked streets of a crumbling Baghdad. They have landed in the country of Iraq to collect a debt, the first half of which was paid for their murderous work, on the grubby international stage of guns for hire, but the contractor has not kept a promise to pay the second part of the installment, once the job is done.
Although there was no trust in the venal business of international wet work, occasionally there was respect, and Burleigh Morgan was respected. Other top independent assassins would accept a job from him, which was why Saddam Hussein had hired him to put together a team for a series of particularly sensitive international terminations. Besides Morgan, the Basque, and the Russian, there were a former jihadist, a retired Mossad operative, and a peripheral member of the Cosa Nostra. They had executed their assignments perfectly. The problem was, Saddam had never paid the second half of what he owed them.
They could have sent a lawyer's letter, but the debtor would probably not have replied. At that point, Saddam Hussein Abd al-Majid al-Tikriti, the fifth President of Iraq, to give him his full title, certainly couldn’t have reached for his checkbook to catch the last post. Assassins do not prefer to deal in correspondence anyway; they prefer hot, unrelenting lead.
[It's because of the stamps. They hate buying stamps...]