After Molly dies, her husband and three young daughters struggle to face their first Christmas without her. But eight-year-old Emily is convinced her mother will come and visit her at Christmas.

Hunted by government agents and constantly assaulted by a cartel of vengeful thugs, an amnesiac known only as "626" searches for her true identity while protecting a teenage girl who shares her superhuman abilities; but when 626 uncovers the horrifying truth about her past, she must infiltrate enemy headquarters to expose a corporate conspiracy that threatens the free world,before she and her companion are silenced forever.