Donald E Westlake 
The Comedy is Finished 

The year is 1977, and America is finally getting over the nightmares of Watergate and Vietnam and the national hangover that was the 1960s. But not everyone is ready to let it go. Not aging comedian Koo Davis, friend to generals and presidents and veteran of countless USO tours to buck up American troops in the field. And not the five remaining members of the self-proclaimed People’s Revolutionary Army, who’ve decided that kidnapping Koo Davis would be the perfect way to bring their cause back to life…