English reader at level A2.2. Part of a series of readers ranging from level A1 to C2. In this story, Sally is a regular 16-year-old with a regular life—until she picks up a ringing public phone late one night. A voice on the line says, "I need your help. Don't hang up." After that, the phone rings again every night with more clues, strange names, and warnings. But no one else hears it.