Jenna Fox chronicles

Before he can start a life with Jenna, seventeen-year-old Locke, who was brought back to life in a newly bioengineered body after an accident destroyed his body 260 years ago, must do a favor for the resistance movement opposing the nightmarish medical technology.

Friends Jenna, Locke, and Kara suffer a terrible accident that destroys their bodies, but their minds are preserved in a digital netherworld, allowing the friends to remain connected, until the day Jenna disappears, and then, decades later, Locke and Kara are given new bodies and discover everyone they knew and loved--except Jenna--are dead and gone.

Friends Jenna, Locke, and Kara suffer a terrible accident that destroys their bodies, but their minds are preserved in a digital netherworld, allowing the friends to remain connected, until the day Jenna disappears, and then, decades later, Locke and Kara are given new bodies and discover everyone they knew and loved--except Jenna--are dead and gone.