Headhunters - Mark Dawson

Headhunters is the seventh novel in the John Milton series.

A sheep station in the Australian outback is about as far from civilization as you can get. John figures he's pretty safe now. Unfortunately, Avi, the ex-Mossad agent, just can't seem to let the whole revenge thing go. Trouble is coming, and John isn't the only person who's going to be in it. Very highly recommended.