From publisher blurb:
GRAVE ROBBERS has the player characters investigate a mausoleum in the hopes of catching a group of notorious grave robbers red-handed. The only problem with this noble idea is that there are no grave robbers. The PCs past is coming back to haunt them. One of the enemies of the PCs is now dead and Lord Wrathgaite is taking his vengeance upon the party in the goriest and most gruesome way that he knows. By locking them overnight into a crypt filled with skeletons, zombies, ghouls, wraiths, wights, ghosts and a vampire.
Most of THE BOOK OF DARK SECRETS short adventures have a darker than the norm undertone to them, hence the series title name. This is not a particularly dark adventure, but still, as always, this is for adult and mature audiences, please.