Detective Sarah Burke is called to a mass shooting in a quiet residential street; it looks like a 'home invasion' gone very wrong. There are several dead bodies but the crime scene just doesn't make sense -- until one of the 'dead' victims suddenly escapes and another man is seen running from the house . . . Once again, as well as juggling her complicated home life, Sarah Burke is faced with a ballistics mystery to find out exactly what went down -- and why.