A Knock on the Roof is strong stuff. The well-written monologue’s repetitive motifs of packing and running propel both Mariam’s harried narrative and Ibraheem’s urgent performance. In depicting a seemingly frail young woman in baggy mom jeans and white running shoes who turns obsessive in her pursuit of safety, Ibraheem creates the voices of Mariam as well as her several loved ones. Possessing a rich, alto voice matching her dark-eyed looks, Ibraheem speaks with a Middle Eastern accent that may be challenging for some members of the audience to comprehend, likely depending on where they are seated at New York Theatre Workshop. (During certain passages of the performance, I was losing every fourth or fifth word.)