From the campaign:
17 October 1903.
The Esperanza ends up in a terrible storm and loses its battle against the elements. 163 people lose their lives, but a small group survives this disaster and washes ashore on the isle Juan Ansidad. For weeks they wait, hoping to be rescued, but they slowly run out of food. They come to realise; if they ever want to get home again, they will have to take matter into their own hands again. A raft is carefully put together and with a small ration four brave survivors try their luck on the Pacific, looking for salvation.
You have found the logbook in which the four survivors wrote down their adventures; their story, which lasted 21 days.
In 21 Days you relive the events recorded in the found logbook, over a period of 21 days. The purpose of the game is to have (at least) one of the survivors rescued by a ship on the 21st day.
You do this by following the events described in the logbook and having the survivors choose and perform actions on the various locations on the gameboard.
The game is about 3/4 of the way to its funding goal with still 24 days left to go.