Grout's Mansion

After you get the blood from the lab fridge, you go down stairs. In the patient room across from the entrance, there was a something on the floor. I don't think I picked it up, but it disappeared.
Also, the ammo room to the left has a new phone/recording device i it. It makes the tape recorder sound effect when I activate it, but I don't hear anything.

Hey Freddish,

what you picked up probably was a morphine bottle. There are several in the mansion, and if you have one in your inventory, they get auto picked up, just as ammo for a gun you already have, only without a sound effect.
The phone was introduced by Wesp in one of the patches. It's supposed to unlock the secret doors.

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What is the purpose of this secret door? It seems there is nothing of value behind it. At least in my walkthrough I didnt find anything behind this door.

Thanks Childe, morphine was the answer.
Sloul, I've always thought the upper walkway was to let you know which rooms had vamps in them. Kind of pointless, though, you're right. I'm going to open the doors anyway.