Well, this was a very short but very welcome historical experience.
Each scene puts you in a different situation as the servant of mathematician/alchemist Napier. You are his hands and eyes in this easy treasure quest.
The scenes are very well written, letting you feel the atmosphere of the castle, the cave,... The NPCs have distinct characters, adding to the immersion in the story.
All in all, more a series of historical impressions than a full-fledged game, but very enjoyable.
Great side-effect of this game: it sent me on my own treasure hunt to find out more about this John Napier, an intruiging personality in the history of mathematics.