Info about the Portal system.
Probably the movies changed writing more than the other way around. And of course all the forensic advances. I was watching a Miss Marple the other day (ok laugh at me) and the two detectives enter the crime scene where a body is sprawled across a desk with a huge knife sticking out of his back. The detectives ask a few questions of the family and Miss Marple and then one says, "I think we're done here." For some reason that made me giggle. Times have changed!
Body count: 0. Fights/torture scenes: 0. Car chases: 1 (one page). Explosions: 0. Sex scenes: 0 (implied fade-to-black canoodling). Saving-the-world tropes: 0. Psycho-killer villains: 0. Most of the book consists of two to three people sitting about, talking. Yes, the "greatest thriller writer of our time" wrote...a cozy. It may not have been a cozy in 1964, but it certainly is one now.