Dark Days: A Memoir is by D. Randall Blythe. It has 498 pages.
Dark Days (Dead City Book 3) is by James Ponti.
It has 304 pages.
When It Was Dark has 412 pages.
Dark Empire I has 152 pages.
Touch the Dark has 307 pages.
A Dark Traveling has 143 pages.
A Dark Victory has 317 pages.
A Dark Winter has 328 pages.
Dark Things has 330 pages.
Reading in the Dark has 220 pages.
Dark Watch has 357 pages.
Dark Challenge has 368 pages.
In the Winter Dark has 132 pages.
The Dark Goddess has 423 pages.