Caroline Wahl, 31, has published three novels to date. All three shot to the top of Germany's fiction bestseller lists.

Now, her fourth book is set to be released on August 28: "1999 Meter über dem Meer" (1999 Meters Above Sea) tells the story of a young woman who takes on a false identity to mingle among the high society in St. Moritz, Switzerland.

It is one of the most anticipated new books of the summer in Germany.

So what is the secret to Caroline Wahl's success?

Debut with a bang