Some parts of your description suggest that this film may be The Legend of Hell House (watch out for spoilers in the wikipedia article).

Specifically:

• A woman goes into a trace at some point.
• There is a hidden room discovered.

I don't recall organ music being involved in the trance. Note that there are similar films (see also The Haunting of Hill House).

Some parts of your description suggest that this film may be The Legend of Hell House (watch out for spoilers in the wikipedia article).

Specifically:

• A woman goes into a trance at some point.
• There is a hidden room discovered.

I don't recall organ music being involved in the trance. Note that there are similar films (see also The Haunting of Hill House).

Some parts of your description suggest that this film may be The Legend of Hill House (watch out for spoilers in the wikipedia article).

Specifically:

• A woman goes into a trace at some point.
• There is a hidden room discovered.

I don't recall organ music being involved in the trance. Note that there are similar films (see also The Haunting of Hill House).

Some parts of your description suggest that this film may be The Legend of Hell House (watch out for spoilers in the wikipedia article).

Specifically:

• A woman goes into a trace at some point.
• There is a hidden room discovered.

I don't recall organ music being involved in the trance. Note that there are similar films (see also The Haunting of Hill House).