Stacey Dooley travels to Chicago, the murder capital of the US, where almost half of those killed in 2013 were under 25. She meets the Hardman family, struggling to come to terms with the murder of their 19-year-old daughter Ashley, killed in the crossfire of a gang shooting. In a prison boot camp for young offenders, Stacey gets to know David. He's been in prison four times already and he's just 19. He got his first gun at 14. Can he really turn his back on the gang lifestyle?