A burst of violence over the first weekend in August left 13 people dead and 62 wounded. So far charges have been brought in at least four cases.
That's about average for Chicago police detectives, whose clearance rates have fallen to embarrassing lows, some 20 points below national averages and far beneath other big cities such as New York and Los Angeles. National experts call the numbers alarming and say it can't be simply explained by poor detective work or lack of cooperation from victims and witnesses.
The Tribune spent the past five months analyzing that August weekend, examining the struggle to close cases and the tensions it creates in the department and the community.
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