Complete pack for doing a graphic adventure. Great documentation, author fast-replies at the Unity asset's forum. You'll get game logic scripting with actionlists, hotspots, camera, player, inventory, save&load, string localization, dealing with speechs, different interfaces, 2D (unity 2D or with 2DToolkit), 2.5D and 3D workflow, pathfinding (navmesh or unity navigation), menu system... take a look at the demo and videotutorials you'll see what is capable of. And the source code is included, well written and easy to understand and improve.
Edited: A few months has passed since this asset launched and I can't recomend it enough. It's impressive! I'm using it on two projects I have around! I updated the review just to add the new systems added... and more to come.