<prompt> Translate the following text to EnglishKama mwandishi wa kwanza wa hadithi za siri, Christie alipewa tuzo ya Mwanafunzi Mkuu na Mshahidi wa Mashtaka na Mwandishi wa Hadithi za Siri na Mwandishi wa Hadithi za Siri na Mwandishi wa Hadithi za Siri na Mwandishi wa Hadithi za Siri na Mwandishi wa Hadithi za Siri.  <response>: In 1955, Christie was the first recipient of the Mystery Writers of Americas highest honor, the Grand Master Award, and in the same year, Witness for the Prosecution was given an Edgar Award by the MWA, for Best Play. 