内容简介：
Robyn and her best friend, Claire have to find out who is making the freaky anonymous phone calls to Robyn's home before it's too late. Robyn's mother is away on a business trip, Claire's parents wouldn't be able to help, and two girls from Robyn and Claire's school, Alice and Madeline, aren't making things any easier. Can the two girls find out who is making the calls before it gets to be too late?