turn of events vs upshot

turn of events

noun
  • A deviation from the expected course of events. 

upshot

noun
  • A positive aspect or consequence, often either unexpected or in contrast to other negative aspects. 

  • The final result, or outcome of something. 

  • A concise summary. 

How often have the words turn of events and upshot occurred in a corpus of books? (source: Google Ngram Viewer )