This Mystery is Excellent! ~ Challenge from Bestseller Writer

The story

Kashiopea no Endo Roru A murder takes place on a luxury overnight train which runs from Sapporo to Ueno, Tokyo. The victim is a film director. The suspects are 4 women.
Nokosareta Senritsu
After a pianist concludes her best performance to date, she dies mysteriously in the waiting room. The cause of her death is potassium cyanide that was laced in her coffee. Kuroi Pan Teru
A man works as a supervisor for a construction company. 30 years ago, he was a popular actor who played a hero character on TV. Now, he has a wife and a 20-year-old daughter. One day, the man learns that his daughter is kidnapped. Daiyamondo Dasuto
A cold wave hits Tokyo. Two men, working for the same company, are unable to avoid overtime work that night. The snow storm then causes electrical outages. The two men must face difficult life or death decisions.