Three's A Crowd oleh Beth Kean

Ruth has always been a little strange but Helen never let that interfere with her friendship, she always wanted to protect & shield the odd girl from the teasing of her peers. Years have passed & now Helen is a trained shrink, she wants to delve into Ruth's mind & find out what makes her tick... but what she discovers sends a chill down her spine... because Ruth's mind is not alone in there!