Turkish President Recep Tayyip Erdogan (L) meets King of Saudi Arabia, Salman bin Abdulaziz Al Saud (R) at Riyadh's Erga Palace in Saudi Arabia on March 2, 2015.  Kayhan Ozer | Anadolu

Agency | Getty Images ISTANBUL – When Turkish investigators entered the alleged murder scene inside the Saudi consulate, they were met by the tell-tale aroma of industrial-strength cleanser

and fresh paint. However, they were not surprised, having been alerted by Turkish security services that the Saudis had sent an expert team inside to conceal as best as possible their likely

crime of two weeks earlier. The notion that Saudi journalist Jamal Khashoggi had himself relayed to the world via his Apple Watch evidence of his own torture, killing and dismemberment was

the world and at what moment. The most dramatic fruit of President Erdogan's efforts came late Friday, when the Saudi government said it had fired five senior officials and arrested 18

other Saudis as a result of the investigation that the Turkish leader forced to happen. It was a dramatic turnabout from initial Saudi insistence that Khashoggi had left the consulate

unharmed, while still protecting Crown Prince Mohammed bin Salman through the narrative of a fistfight gone wrong. Most damning was news that those fired included Saud al-Quahtani, the crown

prince's ever-present adviser, who was reported to be at the scene, and deputy intelligence chief Maj. Gen Ahmed al-Assiri. President Donald Trump called the Saudi moves "a good

start," leaving the world to wonder what might be the next Saudi shoes to drop in a story more gripping than the best fiction. This once-Ottoman and now-Turkish capital has been the

setting for some of history's richest plots, from Eric Ambler's Constantinople to Agatha Christie's Istanbul. Yet what has unfolded in real time over nearly three weeks,

let's call it "Murder on the Bosporus," is far more gruesome in its details and endlessly richer in its geopolitical complexity than any novelist's best-spun scheme. It

is equal parts murder mystery and geopolitical thriller, with historic stakes that could shake an Arab monarchy, shape regional security, influence global Islam and even impact crucial

midterm elections in the United States, the world's most powerful democracy. A senior Trump administration official calls the situation "the biggest foreign policy challenge

we've faced." A Mideast ally sums it up in more graphic terms as "a freaking mess." > The most worrisome aspect of the Khashoggi affair and its aftermath, > says 

one well-informed Western diplomat in Turkey, is the glimpse it > provides into an unraveling world order constructed by the U.S. and > its allies, and the jungle that appears to be 

growing in its place. The most worrisome aspect of the Khashoggi affair and its aftermath, says one well-informed Western diplomat in Turkey, is the glimpse it provides into an unraveling

world order constructed by the U.S. and its allies, and the jungle that appears to be growing in its place. By this diplomat's account, the story begins with a monarchy's violation

of the Vienna convention through the use of a protected diplomatic mission for a murder. This all-too-true story is then "weaponized" against that kingdom's crown prince by a

Turkish rival whose own record for muzzling free speech is a matter of public record. Both the Turks and Saudis then turn to the individual most able to influence outcomes, a U.S. president

who is more transactional than traditional in his vision of values-driven U.S. global leadership. ERDOGAN'S EXQUISITE TIMING One of the least appreciated aspects of this drama is the

influence of Turkish President Erdogan, who has shown the ability, through the well-timed release of crucial details, to fuel the global outrage against Saudi Arabia or tamp it down, driven

by his unique mix of outrage and calculus. Western diplomats believe the Turkish leader's rapid response was driven by a mixture of regional rivalry, religiously motivated disgust and

diplomatic cunning. By these accounts, he was outraged that his Saudi neighbors would so brazenly act on Turkish soil and was further inflamed that the victim, Jamal Khashoggi was "a

brother" – a long-time friend of the Muslim Brotherhood, the sworn enemies of Crown Prince Mohammed bin Salman. Beyond that, Erdogan used the opportunity to weaken Saudi Arabia's

rising Crown Prince Mohammed bin Salman. He at the same time further burnished his image with U.S. President Donald Trump, as U.S.-Turkish relations emerge from a low point. The timing of

the Khashoggi death on Oct. 2 and the Turkish release of American Pastor Andrew Brunson 10 days later from house arrest likely was coincidental. However, Turks hope that their intelligence

sharing around the murder, and U.S. distancing from Riyadh, will contribute to their own efforts to further improve relations. Though Erdogan would never have wished for such a tragedy,

Western diplomats say he has thus far he has managed the situation skillfully. They believe he slowed the release of damning details after it seemed Trump might throw the Saudi crown prince

under a bus and following the Saudi king's intervention to repair relations with Turkey. When both Trump and the Saudis appeared to veer from this more cooperative course, the Turkish

revelations again accelerated. Reports primarily in the Washington Post, the New York Times and Sabah, a newspaper close to the Erdogan regime, included details of the two private

planes' arrival and departure from Istanbul, and now as well have included the names and ages of their 15 passengers, a dozen of whom have links to Saudi security services. One is now

said to be Maher Abdulaziz Mutreb, a frequent travel companion on Crown Prince Mohammed bin Salman's diplomatic missions. GRISLY DETAILS Details from the audio – according to the Sabah

newspaper and a Turkish official -- have the consul general, Mohammed al-Otaibi, saying to the killers, "Do this outside. You will put me in trouble." To which one of the agents

replied, "If you want to live when you come back to Arabia, shut up." Turkish officials, reporting on the audio, focus on what they say is the voice of a Saudi doctor, who had come

along to help with the dismemberment and disposal of the body, which Turkish officials cite as evidence of pre-meditated murder. As agents cut off Khashoggi's head and limbs, the

doctor provided advice that they listen to music, as he would then do himself, to ease the tension. If this were a novel, this would be grist for a page-turner. As reality, it couldn't

be more disturbing. There appears to be only one reason the tapes haven't yet been released for international inspection yet – that President Erdogan is holding them for even greater

leverage. For all the damning evidence, he also hasn't pointed his own finger or that of other Turkish officials at Crown Prince Mohammed bin Salman. No one can predict where this story

ends for Saudi leadership, U.S.-Saudi and Turkish relations and President Erdogan's regional role. What's safe to predict is that Erdogan is likely to provide a few more plot

twists before this is all over. He's retained the most powerful leverage of all, if it exists: the actual video, or possibly audio, that could still undermine the latest Saudi

narrative. The final chapter of this drama has yet to be written. _Frederick Kempe is a best-selling author, prize-winning journalist and president & CEO of the Atlantic Council, one of

the United States' most influential think tanks on global affairs. He worked at The Wall Street Journal for more than 25 years as a foreign correspondent, assistant managing editor and

as the longest-serving editor of the paper's European edition. His latest book – "Berlin 1961: Kennedy, Khrushchev, and the Most Dangerous Place on Earth" – was a New York

Times best-seller and has been published in more than a dozen languages. Follow him on Twitter __@FredKempe_ _and s__ubscribe here__ to Inflection Points, his look each Saturday at the past

week's top stories and trends._ _FOR MORE INSIGHT FROM CNBC CONTRIBUTORS, FOLLOW __@CNBCOPINION__ ON TWITTER._