The Outlaws Scarlett and Browne by Jonathan Stroud-Young Adult

Scarlett McCain is a shoot-first ask-questions-later kind of outlaw. She scrapes by on bank heists, her wits—and never looking back.
 
She’s on the run from her latest crime when she comes across Albert Browne. He is the sole survivor of a horrific accident, and against her better judgement, Scarlett agrees to guide him to safety.
 
This is a mistake. Soon there are men with dogs and guns and explosives hot on their heels. Scarlett’s used to being chased by the law, but this is extreme. It was only a little bank she’d robbed . . .
 
As they flee together across the wilds, fighting off monstrous beasts, and dodging their pursuers, Scarlett comes to realize that Albert Browne is hiding a terrible secret. And that he may be the most dangerous threat of all.
 
In this fast-paced, quick-witted whirlwind of a story, Jonathan Stroud introduces two unlikely allies—the outlaws Scarlett and Browne—who are about to become the most notorious renegades in all that’s left of Britain.