Judy rather than taking the popular behaviour route instead decides to speak her mind.
The jealousy of Lorraine is played up as she doesn't like Judy (obviously due to the fact that Arthur is interested in Judy, this was indicated in the first book and continued here in the second)
The mystery itself, it's hard not to enjoy the old haunted house aspect that mystery books love to use.
This I thought was done well. Not the stock standard.
One thing that Margaret Sutton is good at is making you take sides, must say I didn't even like Lois that much for a while.
Interesting to note that Peter is the knight in shining armour and turns up to console Judy just when she needs it.
The book contains more than one mystery (some are loosely called mysteries, more "discoveries" really. The idea that there is more to learn though does keep you interested, similar to the way the Kay Tracey Mansion of Secrets kept me interested because there were more treasures to uncover.