Zombies of the Gene Pool by Sharyn McCrumb
Well, okay - another go round with these characters. Interesting enough - again with the very dated depiction of the SF scene, but a better mystery than the first book. I find her love/hate relationship with fandom kind of conflicted - it makes this not as likeable a story as it could be.
In the 1950s, a group of young science fiction writers, dreaming of literary immortality and calling themselves the Lanthanides, buried a time capsule with their stories and relics from the time. Now, in the 1990s, when several of them have become famous, the surviving Lanthanides are getting together at a special convention to dig up the capsule and open it. But the convention is startled by the appearance of a writer who was supposed to have died thirty years ago. Then murder materializes to throw the agenda further into chaos. Now, Jay Omega, author of Bimbos of the Death Sun, and his significant other, Dr. Marion Farley, must separate science fact from fiction -- and unearth a killer with a story of his own to tell.