Tom Clancy Novels
Aside from science fiction and fantasy novels, I usually don't read too many books in my liesure time.  There is one author, Tom Clancy,  however that I do enjoy reading.   I find his novels fascinating for their realism and attention to detail.  Probably my favorite character in Clancy's novels is John Clark instead of Jack Ryan.  Clark doesn't appear in as many books, but his character is very interesting all the same.

Some of the Tom Clancy novels I have read are:

Hunt for Red October
Red Storm Rising
Cardinal of the Kremlin
Patriot Games
Clear and Present Danger
Sum of All Fears
Without Remorse

Rainbow Six
Op-Center - Acts of War
Op-Center - Mirror Image
Net Force