Murcielago, Vol. 20 Av Yoshimurakana

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