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?