Mr A (the dreamer) opens a door and is walking into a room. He senses an invisible presence. He cannot see it but felt and hear its eerie presence.
Symbolism involved (Symbols are highlighted above)
Door: Represent opportunity. Open door may mean the opening of an opportunity.
Room: House, Building represent self. The rooms represent various aspects of it. Also represents body.
Invisible Presence: Possibly indicative of an aspect of self that is still not fully known to the conscious personality of the dreamer.
Symbols were taken from Dream Diary Assistant full version
The Interpretation
Mr A entering a room indicates that he is accessing an aspect of himself. He is still not fully aware of this part of himself (as indicated as the invisible presence). His opening of a door however indicates that an opportunity to know more about this aspect of self is now becoming available.