I am a regular reader, but for someone that isn't, you can't go wrong with Lee Childs or Clive Cussler. Both write bubblegum action books, they don't need much attention span, and they're usually packed with action from beginning to end. Childs books are mainly Jack Reacher, the 6'5 Hulk of a man one though, not weedy Tom Cruise. And Cussler mainly writes about Numa, they're basically Indiana Jones with a marine biology twist, pure Hollywood nonsense like raising the Titanic, or finding Atlantis, or Genghis Khans tomb - the sort of stuff you'd see in Tomb raider or Uncharted games. Martina Cole is good too, as is Patricia Cornwell, or Karin Slaughter, or Karen Rose, or early Stephen King when he was still on the coke. All easy to follow books without much pretension, Cornwell can be a bit wordy and medically specific at times but if you like anything CSI related you'll love them.
If you really want to challenge yourself, try The Idiot or The Brothers Karamazov by Dostoevsky, if you can finish either of those, you're officially a proper reader.