"London, 2023. Daniel Ambler is asked by MI6 to re-connect with Natasha Guseva, an old flame. Natasha is the former fiancé of Valentin Orlov, a Russian oligarch .. recently killed in a helicopter crash [who] had links to both the FSB and criminal underworld. Ambler must discover if Natasha is still in possession of Orlov's assets. Assets which the British security services would like to appropriate, before the Kremlin can."