"The Truth is a Cave in the Black Mountains" is one of the best Neil Gaiman stories I know. This is one of those stories in which the plot unfolds like a whodunnit from the start.
It begins with a father talking about his daughter. As the story unfolds, we find out what happened to her and why he has to seek a guide to the cave in the Black Mountains where a bitter treasure abides.
Starship Sofa 232