Cold case murders are those defined that for one reason or another have not been solved. Cold case crimes are among the most difficult to solve for many reasons and the longer the case goes unsolved, the less likely they are to ever come to closure.

Despite increasing advances in scientific and forensic technology, it's not always the physical evidence that determines the resolution of a homicide. In most trials today, it's also vitally important to tie the suspect to that physical evidence.

Never Solved: The True Stories of America's Most Notorious Unsolved Murders is the 5th of John Summit's True Crime books and profiles seven stories of the most notorious true crime mysteries in American history. These cases will leave you flabbergasted at the bungled police stories, leave you wondering how likely suspects were never prosecuted and leave you sympathizing with the families of the victims who never saw closure.