FINAL STOP ALBUQUERQUE is Alice Zogg’s 6th mystery novel in her R.A. Huber series.  Also featured is the sleuth’s dynamic young assistant, Andi, whom the author introduced in “The Fall of Optimum House.”   Elena Campione seemed to have vanished into thin air.  She had apparently left her South Pasadena residence without telling a soul. The police traced her to Albuquerque, New Mexico, where she was last seen boarding the shuttle bus to the Balloon Fiesta Park on the last day of the annual balloon festival. Bruno Campione hires R.A. Huber to find his missing wife.  The investigation takes Huber to several towns in Arizona and New Mexico, while Andi pries into matters closer to home.  When Elena’s body washes up at Lake Havasu, it is no longer a missing person case but a homicide.  The women’s probing into the murder puts them both in harm’s way.  Huber ends up in the hospital in critical condition, and Andi also barely escapes with her own life.