Murciélago, Vol. 20

Kuroko's group goes to a hot spring deep in the mountains, where theentirety of the
land is owned by the wealthy Yamatsukami family. But right asthe family is going to
decide the next heir, the third son is foundmurdered... To make matters worse, the
only road in and out of the area issuddenly destroyed! Cut off from the rest of the
world, the family begins towhisper about a mysterious "Ayako." With little to go on,
how will Kurokosolve this closed-room case?