Size 12 is Not Fat by Meg Cabot is the first in the Heather Wells series of mysteries.

When you peak at fifteen, where can things go but downhill?

Former teen pop sensation Heather Wells has hit rock bottom: tired of singing other people's lyrics, she hasn't exactly been bombarded with recording contracts for her own songs. Worse, Dad's in jail, Mom's bolted for Buenos Aires, and Heather can't seem to stop drowning her sorrows in Kit Kat bars. To top it all, Heather's fiance Jordan Cartwright has replaced her - on the charts as well as in his bed - with America's newest number one pop sensation, Tania Trace.

When Heather finds a job in a New York college dorm - right around the corner from her temporary digs in her gorgeous friend Cooper's attic apartment - things seem to start looking up. . . at least until girls in the dorm begin to perish at an alarming rate. Elevator surfing is the official explanation from university administration, but Heather has other suspicions, and - enlisting a reluctant Cooper's aid - she attempts to get to the bottom of the rash of teen deaths in the building where she works, never knowing that it isn't her supper she'll be singing for this time, but quite possibly her life.