The expansion adds one player and 55 cards to the game. Here is a description of the expansion from the publisher:
The Game of Inauspicious Incidents and Grave Consequences
In the Gloom card game, you make your eccentric family of misfits suffer the greatest tragedies possible before helping them pass on to the well-deserved respite of death. Just mix the 55 transparent cards in this set together with your copy of Gloom to add morbid new Modifiers, Events, and Untimely Deaths, and a new family of intrepid explorers who've faced misfortune across the globe. These days Colonel Bumpersnoot is really more of a bargain hunter, while Lady Bumpersnoot struggles with high society -- but she always loves to have guests for dinner. Their Towering Treehouse is included as a Residence card to use with the Unhappy Homes expansion.
Sold Out - $55.00
You are a monarch, like your parents before you, a ruler of a small pleasant kingdom of rivers and evergreens. Unlike your parents, however, you have hopes and dreams! You...
Sold Out - $68.00
This is the 2nd addition to Dominion. It adds 26 new Kingdom cards to Dominion. Its central theme is your next turn; there are cards that do something this turn...
Sold Out - $38.00
This is the 3rd addition to Dominion. It adds new Kingdom cards to Dominion and as it is an expansion, you will need Dominion, or Dominion: Intrigue to play the...