The Murder of Grammar House

Detective Daniel White has received a strange, encrypted, late night phone call.

The electronic voice tells him to come alone, to the awfully mysterious Grammar House. When he arrives he finds that there are other people that also received the same phone call. While very cautious at first, he eventually loosens up-one mistake he will never make again.
White is the perfect detective for the job. However, he questions himself and his actions. But that may be a fatal mistake.
Can he make it through this case? If so, can he figure it out before it's too late?

Can he catch the crook and solve the mystery?

"Detective White!" he screamed, "I have come! This is why you are here, the others were just bait, I have always meant to kill you!"

"Yes, Mrs. Ryce, I understand quite well. I would also like to keep most of my informations a secret. After all, you never know who's lurking behind every shadow."

Thank you for your time,
As always,
C. R. White