According to the "National Snooper", the queen of planet Zagon is on earth. It seems pretty silly until Nancy and her friends have a new substitute teacher, Ms. Zagon. Kate Zaleski says Ms. Zagon is an alien. Nancy says she's not, and she's going to prove it--along with the aid of a talking parrot who's helping her solve the whole mystery. (Digest) .

שם הספר
The clue in the crumbling wall - NANCY DREW MYSTERY STORIES #
Secrets can kill - 1 ; THE NANCY DREW FILES #
Deadly intent - 2 ; THE NANCY DREW FILES #
Murder on ice - 3 ; THE NANCY DREW FILES #
Smile and say murder - 4 ; THE NANCY DREW FILES #