Titles can be tricky, and 'From Darkness Into Light' is one of those titles that turns up in very different places — so the title
alone doesn’t tell you the genre. A historical
novel usually means a fictional story set in a recognizable past era, with period detail and characters (real or imagined) who act within that historical context. If the book you're looking at fictionalizes people or events from the past, reconstructs social customs, and aims to immerse you in a specific time, then calling it a historical novel would be fair.
That said, I've come across books with the same or similar titles that are memoirs, spiritual guides, collections of essays, or even poetry. To figure it out fast, check the
blurb, the book’s subject keywords, and where bookstores shelve it — publishers and libraries usually tag the genre. Look for signals: author notes about research, historical timelines, real historical figures appearing in the narrative, or a clear past setting (war, a particular century, etc.). Reviews and the first few pages are gold for this; the voice and level of period detail reveal a lot. Personally, I get excited when a title like 'From Darkness Into Light' turns out to be a historical novel because that sense of moving through eras often gives the story real emotional weight.