The Valiant (Spy Girl 4)

Save the Prince. Save the World. Spy Girl.

What will happen when the world goes ka-boom? 
The assassin known as The Priest was tasked with a series of three hits, and the last one blows up in his face--literally.
People will die.
People will go on.
Unlikely alliances will be formed.
And when British intelligence learns that a series of nuclear backpack bombs were smuggled into their country, there's a lot more to worry about than discovering why a covert agent was assassinated over six years ago or what's going to start in Montrovia.