A PRINCIPLE OF LIGHT is the sweeping tale of strangers caught in the turbulent spring and summer of 2016 in Turkey. TWO WOMEN Nilesen Yilmaz, a widowed Turkish poet, and Jeannie Maurillac, an American photographer, are thrown together when they witnessa bombing in Istanbul. A MYSTERY Convinced their knowledge of the crime puts them in danger, they go on the run, unaware of the secrets they are about to uncoverand the life-changing decisions they will face. ONE CHANCE As their friendship grows, so do the dangers they face, forcing each woman to decide how much she is willing to risk for her art, for the truth, and for love.