Nearly a decade after getting chased out of the Army for fighting back against abuse, Monna Locke´s skill and discretion have made her the go-to safecracker for Los Angeles clients who need vaults opened and no questions asked. When a lawyer hires her to retrieve a box from his client´s mansion, it seems like an easy payday-until she opens the safe and is immediately attacked by heavily-armed men. Locke barely escapes and returns to her isolated cabin only to find the client waiting in her home, threatening what she holds most dear: her son, Evan. After being knocked unconscious, she wakes up across the country, trapped in her own personal nightmare: she and Evan will be held captive until she helps a seedy crew pull off a seemingly impossible heist. Forced to practice breaking into the most impenetrable safe ever designed, Locke bides her time and eyes her escape routes. She knows there´s no way to finish the job she´s been forced into, but it´s either crack the lock, or lose everything.