The Man Who Killed Rasputin

This was my first time reading Greg King, who writes a lot about Imperial Russian history, and I was surprised that he seems to be a bit of a Rasputin apologist. He's much less charitable towards his actual subject- Prince Felix Yusupov, the fabulously wealthy and often impetuous aristocrat who was the ringleader of the group that carried out the titular assassination. I appreciate that he explored multiple accounts how events unfolded, though he seems to give unusual credence to some sources (like Rasputin's daughter, who was not present) that would not tend to be overly reliable. I'm now more interested in reading Yusupov's own memoirs.