Charlotte Adams has spent her entire life in the organization known as Echo. Raised by scientists, she was trained at the prestigious Echo Academy before being dispatched to the desolate Antarctic base. There, Charlotte embraced a life of deadly missions under the training of Linda Williams and the Warrior.
After escaping the clutches of Doctor Anderson, Charlotte finds herself hiding in the bustling streets of New York, hoping to evade both Echo and the Immortal Agents. Her attempts at concealment, however, are thwarted during a fateful night at a bar when her estranged father, General Benjamin Wilson, and Immortal Agent Warren Thompson, come to her rescue.
Now safe within the walls of the Immortal Agency mansion, Charlotte is forced to confront forgotten memories and uncover the truth about her past.