Melissa Lloyd is stunned when her older sister, Colleen, vanishes without a trace. Their parents suspect she ran away, but a series of mysterious visitors and menacing phone calls convince Melissa that her sister is in serious danger. Where is the missing jewelry the caller insists Colleen has? How did her sister ever become mixed up with such a sinister figure? Do the answers lie somewhere in the pages of Colleen's diary?
Frightened and confused, Melissa undertakes a desperate search for her sister a search that threatens to bring her face-to-face with her greatest fears.