Yoon Kimn wishes Russell Blake wouldn't write so much.

Ms. Kimn, a 46-year-old IT consultant who lives in Coram, N.Y., is addicted to Mr. Blake's fast-paced mysteries and conspiracy thrillers. In the past two years, she has torn through all 25 of his books. But it is hard to keep up. Mr. Blake has been publishing a new novel roughly every five weeks. In December, he released two new books: a hard-boiled noir detective novel starring a struggling Hollywood private investigator, and a thriller about an ex-Mossad agent on the...