Reboot started with a bang. And ended with a whimper. 
 Sometimes, teenagers reboot after they die - they come back with better reflexes, an attractive face and less emotions. They serve in the military and (rightfully?) most of the society fears them. Every Reboot is assigned a number that shows how many minutes passed between their death and rebooting. It's also a social status thingy - similar numbers tend to stick together. Lower numbers are like ordinary teenagers but dead, bigger numbers are far less human and far less fun. Anything above 120 is really high. The main character, Wren 178, is the perfect soldier - cold, emotionless, never questions her orders. 
 "There's some human left in you, ain't there?" she asked, craning her neck to look at the number above the bar code on my wrist. 
 She froze. Her eyes flew from the 178 printed on my skin to my face and she let out another shriek. 
 No. There was no human left in me. 
 Then a guy comes along. His name is Callum 22, so he's practically still a pathetic human. That's where the book starts rolling downhill. To show us exactly how human he is, Callum smiles all the time and refuses to do anything ever, even when threatened with death. Also, there are like three paragraphs about how rebooting makes everyone more attractive and Callum is really cute in the dead zombie way. 
 So we have an emotionless girl who believes in the system and an overly friendly guy who questions everything. It's pretty clear where this is headed, but that's okay. Overthrowing the system you've served for years while realising you're still quite human is something I would normally enjoy. 
 But Wren goes from a great character to *smiles* *blushes* *omg Callum is so dumb it's sweet* and sorry, but that isn't character development, that's a load of horse manure. Occassionally, "well, I love killing people! I don't care!" interludes are thrown in to show us Wren is still cold and emotioneless. Sure thing bro.