The Amnesiac's Guide to Espionage. Eva Destruction Series, #2

Eva Destruction is Back! Eva is an MI6 agent who wakes to find armed men in her apartment hell-bent on revenge. The only problem is, she has no idea what they're talking about. Someone has stolen the last sixth months' worth of her memories and the fate of the world rides on getting them back. On the eve of the G8 summit, Eva is thrown headlong into globe-trotting assassinations and gun battles on the trail of the mysterious plan known only as Halcyon.
Together with a besotted CIA agent and a misogynistic MI6 operative, Eva races across the world to retrace her steps in the hopes of finding answers. With the clock ticking, Eva must track down those behind her memory loss, as well as battle a foe she can't remember. The globetrotting takes her from London, to exotic Macau casinos, to Hong Kong hydrofoils, to French castles, to English mansions, to a car chase between an ice-cream van containing a nuclear weapon and black SUVs through the streets of London.
With betrayal at every turn, Eva discovers she can't trust anyone, including her own organisation. Eva must face down nuclear annihilation alone and she hasn't even had her coffee yet.