Olivia Decoded (Olivia Twisted, 2) by Vivi Barnes

This isn’t my Jack, who once looked at me like I was his world. The guy who’s occupied the better part of my mind for eight months.

This is Z, criminal hacker with a twisted agenda and an arsenal full of anger.

I’ve spent the past year trying to get my life on track. New school. New friends. New attitude. But old flames die hard, and one look at Jack―the hacker who enlisted me into his life and his hacking ring, stole my heart, and then left me―and every memory, every moment, every feeling comes rushing back. But Jack’s not the only one who’s resurfaced in my life. And if I can’t break through Z’s defenses and reach the old Jack, someone will get hurt…or worse.

The Olivia Twisted series is best enjoyed in order.
Reading Order:
Book #1 Olivia Twisted
Book #2 Olivia Decoded