His "Clear and Present Danger" was the bestselling fiction book of 1989
Seventeen of his novels were bestsellers, and more than 100 million copies .... 
Clancy's novel Clear and Present Danger (1989) sold 1,625,544 hardcover... [DOC] [TLE] Clear and Present Danger (A Jack Ryan Novel, Book 5) - Amazon.com [PAR] Buy Clear and Present Danger (A Jack Ryan Novel) on Amazon.com ... Amazon 
Best Sellers Rank: #63,949 in Books (See Top 100 in Books) ... that, having read 
all of his works of fiction, that Clear and Present Danger is one of my favorites.