Barnaby Jones is a television detective series starring Buddy Ebsen and Lee Meriwether as a father and daughter-in-law who run a private detective firm in Los Angeles, California. The show was introduced as a midseason replacement on the CBS network and broadcast from 1973 to 1980. Halfway through the series run, Mark Shera was added to the cast as the cousin of Ebsen's character, who joins the firm. William Conrad guest-starred as Frank Cannon of Cannon on the first Barnaby Jones episode, "Requiem for a Son", and the 1975 two-part crossover episodes, "The Deadly Conspiracy". The series was produced by QM Productions (with Woodruff Productions in the final two seasons). It had the second longest QM series run (seven and a half seasons) following the nine years of The FBI. The series bore the Quinn Martin trademark where commercial breaks divided each episode into 4 "Acts" concluding with an epilogue. The opening credits were narrated by Hank Simms.