A Federation freighter whose supposed distress call, faked by the Klingons in 2267, drew the Enterprise away from Capella IV and left Kirk's landing party stranded.
The SS Dierdre is a freighter named in the episode Friday's Child. While Kirk, Spock and McCoy are on Capella IV negotiating a mining treaty, Scott, in command of the Enterprise, receives a call from the Dierdre saying that it is under attack by a Klingon ship.
Scott leaves orbit to help and finds no freighter, no wreckage and no attacker. He concludes that the call was a trick to lure the ship away while the Klingon agent Kras works against Kirk on the surface.
On the way back a second call arrives, this time in the name of the USS Carolina. Scott ignores it, quoting an old saying about being fooled twice, and returns to find a Klingon ship barring the way to Capella IV.