Did you mean "Mysterious Creatures" by George Eberhart?
To my knowledge there's no book called "The Mystery Creatures".
Iris DeMent wrote Let the Mystery Be, according to her web site.
Maha Khan Phillips wrote the story.
April de Angelis wrote the play, in around 1993.
James Wight (James Harriot) wrote it
because he is mad.
Mystery Science Theater 3000 - 1988 Attack of the the Eye Creatures 5-18 was released on: USA: 5 December 1992
Agatha Christie
Hernando De Soto
Rusty Hinges
She wrote The Egypt Game.
Aldous Huxley in A Brave New World
Harlan Coben wrote the novel for release September 6 2011