This is the first volume in the children's book series IGEL-Team.
Ingo, George, Enzo, and Lisa have a holiday and spend it on a farm. The four children see many posters of missing cats hung out in the city, and suspect a crime. They become detectives, form a detective club, and give it the name IGEL-Team. Their first investigations lead into an exciting adventure.
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Gradually, the books of the book series are translated from German to English.