Most books listed below are available as paperbacks.
A few are out of print, but worthy enough to be sought out in a library. Could use updating, but if you can't tell a chromosome from a hairball, this is an engaging way to find out. You could just rent the video, but it's not as good. Watson's entertaining yarn probably benefited by the long time lag between the 1953 DNA discovery, the 1962 Nobel Prize, and the 1968 book publication date. The later editions carry an appendix giving greater credit to Rosalind Franklin, whose X-rays of DNA molecules substantially contributed to the discovery.