A 70 year old cold case out of Minneapolis is reopened by 2 detectives who lived near the Klein family in their later years... This prompted Author Jack El-Hai to write about this case with the help of the Klein family who he had already been in touch with for many years after coming across an ad in the newspaper where parents were urging the public to help them with information in the disappearance of their 3 sons. This ad was ran in the 90's.. 40 years after the Klein brothers went missing from a park. The grit and determination of this family intrigued Jack, and pushed him to reach out. Through their contact, Jack and the Klein family grew an incredible bond of trust, leading Jack to tell the story of Kenneth, David, and Danny while also bringing light to the way a crime has ripple effects throughout a family.