Lena thought she'd paid her dues to the French secret service. She'd gone undercover as their courier in order to avenge her son and husband, both killed in a terrorist attack. And now she has a new life in Australia. A new family. So why does she still feel so hollow inside? Lena finds herself reluctantly drawn back into the world of international espionage, this time as a tutor to Islamist suicide bombers at a remote training camp in the Georgian desert. Three girls, in each of whom she sees something of herself. But will it be enough to bring her to save them?