The Sigma Protocol by Robert Ludlum
Published 2002 · 662 pages · 182,050 words · about 12 hours at an average pace
How hard is The Sigma Protocol to read?
The Sigma Protocol scores 50 out of 100 for difficulty on ReadingRate, making it moderately challenging. The score is a weighted composite of nine measures: four of how hard the prose is to parse, five of how hard the meaning is to extract.