hugh kennedy is an expert on arab history and he's written a number of book on middle eastern history. this is his effort to establish the caliphate as it was and the history of an idea. there's an obvious reason why the caliphate holds an obvious appeal for so many young muslim. it was a time when islam ruled the world. baghdad had half a million people during the time of the caliphate. london and paris had maybe a few thousand. this is the muslim world at the height of its power. what they're trying to show is that the caliphate had these ingenious qualities per there's no one caliphate. when it was led purely by worship of god or like any political structure it's much more complicated than that. there were caliphate who were spiritual and those who were warlike. you can find it justification for almost any kind of political audience. i think this is a necessary corrective to this kind of rhetoric. >> one more book you have coming up. >> there's an interesting book in political science called locked in who is written by a law professor and a statistician which is about why we strugg

acquitted of these horrific murders that hugh is accused of in june of 1994 the killing of his former wife and her friend ron goldman and a year and a half later. kennedyted. >> he's exonerated and there's a civil trial where he is find -- found liable. so there's this ambiguity almost that continues to play out and it's a story that won't go away because of the many plot twists that continue to pop up. kennedy: and the failures in the trial itself how he was able to pay millions of dollars to the defense team and they dismantled the prosecution and that left a lot of people very and satisfied obviously with the outcome. is that ongoing dissatisfaction? he's in prison now but that still is not a satisfying and for a lot of people. >> you are absolutely ride continues to be a factor in this emergence of interest in the case from time to time. the fact that he is in jail and is unable to answer these discussions are participate in these discussions leaves a blank slate in which you can assign thoughts prejudices and interpretations. kennedy: criminal justice and race and all the things that are interesting because they resolved themselves and they double