From publisher blurb:
Welcome to 1 on 1 Adventures, action-packed scenarios designed for 1 player and 1 GM. 1 on 1 Adventures #17: The 300th is a Pathfinder adventure designed for one GM and one player.
Recovering consciousness in a pile of dead following a critical battle on the northern borders, the last survivor of a doomed rearguard flees into an ancient underground keep uncovered by the earth-shaking magic of the previous day’s slaughter. The complex, an ancient dwarven fortification, once guarded a cross-mountain tunnel to the civilized lands beyond. If the stirring forces of the frost giant Jarl pass through this tunnel unmolested, they are sure to bring death and destruction to the undefended peoples. As the last of the 300, you must stop this!