Good to the Last Death. Carol Golden, #5

When Carol Golden's husband, Rigo, disappears, she not only has to look for him but also elude the FBI at the same time since there is evidence she may have been involved in his disappearance. She doggedly follows a faint trail, keeping her location a secret from everybody except her friend, Jennifer, a spy-in-training, who takes time off from her top-secret job to help Carol. What they find out is that an organization of "good" people dedicated to saving the earth from pollution and global warming may feel justified in carrying out activities reminiscent of the worst tyrants of the twentieth century as part of their solution, and that Rigo may be the first casualty.
The search for Rigo and the truth will take Carol from her married home of Los Angeles to the ruggedly beautiful Rocky Mountains near Denver where an unusually hot summer is fueling passions that may not be conducive to the long-term viability of the human race. Carol and Jennifer must have concrete evidence of wrongdoing and Rigo's whereabouts before they can call in the FBI, but keeping themselves alive is going to be their first job.
One misstep in the mountains can be fatal.