Introduction to me and the characters

When a mission goes wrong, Chase stumbles upon a girl being held in a secret, eerie underground lab. She looks nothing like him... but her bionics are identical-- same enhancements, same coding, same glitches she's smarter, faster, and better

Her name is Selene Vale, and she swears she has no idea where she came from The lab is all she ever knew

The Davenports take her in. Chase starts to notice eerie similarities-- her fighting style, her instincts, her thoughts, it's like she's the other half of him. Or maybe... a back up plan