Alias Emma

Nothing about Emma Makepeace is real. Not even her name.
A newly minted secret agent, Emma's barely graduated from basic training when she gets the call for her first major assignment. Eager to serve her country and prove her worth, she dives in headfirst.
Emma must covertly travel across one of the world's most watched cities to bring the reluctant--and handsome--son of Russian dissidents into protective custody, so long as the assassins from the Motherland don't find him first. With London's famous Ring of Steel hacked by the Russian government, the two must cross the city without being seen by the hundreds of thousands of CCTV cameras that document every inch of the city's streets, alleys, and gutters.
Buses, subways, cars, and trains are out of the question. Traveling on foot, and operating without phones or bank cards that could reveal their location or identity, they have twelve hours to make it to safety. This will take all of Emma's skills of disguise and subterfuge. But when Emma's handler goes dark, there's no one left to trust. And just one wrong move will get them both killed.