Land of Gehenna

In the seventh day of the seventh year of our landing, the seventh son will be led to Mt. Aramis and we will be delivered.
Captain Hunt of the ship Discovery

This is a short story.
A colony ship landed in the world of Gehenna, named for its desert like environment. The thermal images seen from the ship are not proof of water, but proof of wraiths, who are inimical to the colonists. It has now been seven generations since the landing, and the colony is failing. Palti the last of Captain Hunt's heirs is given a last chance to bring water and life back to his people. This is a short story.

Bonus Story added: The White Snows of Russia.