Jessie has to move with her father from a middle class Chicago neighborhood to a very wealthy, elite neighborhood near Hollywood when her father decides to marry a wealthy woman there. She finds herself in an elite, very competitive school as well. She and her father recently lost her mother to cancer. The woman and her son recently lost their father/husband. There are other losses in this book as well, a brother, a sister. Everyone with a loss is struggling in his/her own way with grief, some more successfully than others.
Jessie is feeling especially misfit in new school, new designer home, no friends when she receives an anonymous message telling her how to start navigating the new school. The somebody who is nobody and Jessie begin to regularly communicate and Jessie begins to have friends again. The course of friendship isn't always smooth but its getting there. The mystery identity of SN keeps one reading and guessing and hoping along with Jessie. The pair play a game - tell me three things to get to know each other and to help Jessie guess who the mystery person is. All in all this is a decent romantic story worth your time. Thats from someone who generally doesn't care for such stories.