Brinewater Grotto is a cave north-east of Solitude, just north-west of the Solitude Lighthouse.
It is where Scoundrel's Folly takes place. The quest is part of the Thieves' Guild quest line which begins when the Dragonborn joins the Thieves' Guild in Riften.
The cave itself is full of bandits (×10) and near the exit, horkers (×3), the latter part of the cave is initially the only part accessible.
- Potions ×5, Silver Ingot, Iron Ingot ×5, Frostbite Spider ×3, dog and bed rolls ×4.
- Chests ~180 (under water), ~1400 (near small camp), ~190 (on small boat), ~1910, ~980 value (L67).
- On shelves at end of cave: Dwarven Sword, Steel Shield, Studded Imperial Armor, Dibella Statue and Orcish Dagger of Harrowing.