When Two Quarrel...

When Two Quarrel... is a German book, illustrated using images from the television series.

Plot
Donald and Douglas fall out and go their separate ways. Soon, they start to miss one another, but neither one of them will admit it. However, when Donald bashes through the buffers, Douglas is called upon to rescue him. Afterwards, they agree that it's good to work together.

Characters

 * Thomas
 * Duck
 * Donald and Douglas
 * Trevor
 * Sir Topham Hatt

Trivia

 * This book is based on the sixth series episode, Twin Trouble.