"Best Sellers" follows a has-been author, played by Michael Caine, who is on a wild book tour with a young editor, played by Aubrey Plaza, trying to save her father's boutique publishing house. Caine's miserable and sharp-witted author just wants to live out his days in peace with a bottle of scotch, a cigar and his orange Tabby cat, but Plaza's hopeful editor pulls him out of his reclusion.