Canetti presents a readable overview of Kafka's intense correspondence with Felice Bauer, providing a rough biographical sketch of the author during this turbulent (two abortive engagements to the same woman) yet productive (Metamorphosis, e.g.) time in his life. I don't think Canetti succeeded in proving his notion that Kafka's landmark novel The Trial is a fictionalized representation of his oddly doomed relationship with Felice, but he does point out several interesting parallels which can enhance your enjoyment of Joseph K's misadventures. The real value of Canetti's book is, in my opinion, the fact that it will probably inspire you to read Kafka's own diaries and the actual letters to Felice themselves, and probably with a greater appreciation as well.