Jamal Khashoggi walked into the Saudi consulate in Istanbul on October 2 and never left. For more than two weeks, the world awaited answers about his disappearance. Days later, information began to leak from Turkish security officials and said that Khashoggi had been killed in the consulate. Over the weekend, the Saudis acknowledged that Khashoggi had been killed—but they said it was an accident, the result of a fight gone awry. On Tuesday, Turkish President Recep Tayyip Erdoğan called Khashoggi’s death a “planned operation” while revealing few details. President Donald Trump at first cast doubt on Turkey’s account of what happened to Khashoggi and pointed out that Saudi Arabia is a valuable economic partner for America, though he said this week that he also is “not satisfied” with Saudi Arabia’s explanation of Khashoggi’s death. During the uncertain days following Khashoggi’s abduction, writers at The Atlantic tried to make sense...