Thrilling and frightening crime stories often capture the American public's attention. Scientists, theorists, and law enforcement examine the evidence in each complicated case. Conspiracy theories emerge, too, despite systematic, professional investigation. Some questions still remain unanswered in many famous cases. This series provides readers with historical information on well-known crimes as well as how scientists, theorists, and others have examined the evidence of each case. Aligned to Common Core Standards and correlated to state standards. Essential Library is an imprint of Abdo Publishing, a division of ABDO.