Identifying all of the skeletons found under Gacy's house will take years, but by reading the clues in the bones, forensic anthropologists can tell what kind of person the Killer Clown targeted.

With only tiny insect fragments from the radiator in Vincent Brothers' car, bug experts can prove his alibi is a lie.

In 1983, police in Leicestershire, England struggle to make their case - until they join forces with scientists, who are just discovering the potential of DNA profiling.