The great thing about the nonfiction market is that there is virtually no end to possible book topics. Humor, history, sports, military subjects, art, music, architecture, interior decorating, economics, even research itself — all are vibrant subjects with nearly limitless slants and focal points. The trick is to find that overlooked angle and match it up with potential readers.

Although agents and editors tend to be wary of any book that seems dated, trends in popular culture can provide the seed of a broader, more timeless book topic. As always, the best nonfiction book proposals will combine extensive research on the topic with a thorough understanding of the marketplace. Without that powerful combination, it can be difficult for the new writer — and even for established pros — to break into these categories. But agents and editors are always looking for great ideas from talented writers who know how to make their ideas scream for attention.