Told in rollicking rhyme, this picture book introduces Quack, a lonely duck in his "lair" at the zoo. One day Quack takes an egg home with him, and much like his inspiration, Dr. Frankenstein, he is shocked by what emerges from the egg. The "monster" chases him throughout the zoo in a fast-paced and funny parody of monster movies. In the twist ending, the monster (actually an adorable platypus) and Quack resolve their differences and settle down to keep each other company.