A detective team apply new techniques to old crimes as they solve cold cases.

A scholarly king and his three companions swear off the society of women for three years, only to have a diplomatic visit from a French princess and her three ladies-in-waiting thwart their intentions.

A BBC anthology series featuring adaptations of detective stories over 45 episodes in three seasons that ran from 1964 to 1969. As with many BBC programmes made before the early 1970s, many of its episodes no longer exist. Of the eighteen episodes from the first season only twelve are currently known to exist; likewise six of the sixteen editions from the second run are considered lost, and just one of the final ten survives in the archives.