• Medusa, Knaur publishing house, Munich 2004, ISBN 3426661527.

Researcher Hannah Peter makes a strange discovery: a Medusa sculpture, with snakelike extremities and a cyclops eye, indicates that there is a cave deep in the mountains, where a fantastically beautiful and incredibly dangerous object is located. A team from the National Geographic Society is assigned to search for this treasure. Along with Chris, the climatologist of the group, Hannah discovers the origin and at the same time the end of an age-old culture.

• Reptilia, Knaur publishing house, Munich 2005, ISBN 3426634589.

The young geneticist David Astbury is asked by the mother of his old youth friend Emily for his help, her daughter has disappeared while on an expedition in the Congo. She was there to hunt the legendary monster Mokèlé-mbèmbé, the sole survivor of the age of dinosaurs. Thus David prepares to go into the depths of the jungle of the Congo. He is accompanied by one native biologist and two large game hunters. When they seek out the ancient reptile at the Lake Tele, the events begin to unfold. The reptile holds a genetic secret, which could forever change the way of life on Earth.

• Magma, Knaur publishing house 2007, ISBN 3426662132.

Seismologist Dr. Ella Jordan gets the news that strange signals are being received in the middle of the Pacific, and they’re much too regular to be caused by anything in nature. They’re coming from the Mariana Trench, which is 10,000 meters deep. Ella drops everything to join a team of researchers heading over there in the most advanced submarine in the world. Along with a Japanese crew, an attractive U.S. Marine officer, and a somewhat shady Swiss professor, Konrad Martin, Ella dives to the deepest spot on Earth and barely escapes disaster: They find a gigantic, perfectly round stone that reacts to their probing with a deadly heat ray.What hardly anyone knows is that hidden away in the mountains of Switzerland is an underground lab where scientists are working on a similar, though smaller ball of stone, found decades earlier next to the corpse of a geologist. Suddenly new signals are detected: first from the North Pole, then Russia, Australia, and the Antarctic. Ella and Konrad Martin find these same inexplicable stone shapes everywhere. When the stones’ signals start to be sent in unison, the resulting seismic waves are so strong that they cause earthquakes and volcanoes, and that’s just the beginning. A countdown to disaster begins, Ella recognizes the terrible truth. The threat does not come from this world.

• 1989 selection list to Deutscher Jugendliteraturpreis (German Youth literature prize). "Das große Buch der Saurier" Ravensburger publishing house

• 1998 Kurd Laßwitz prize for best envelope illustration. "Auf zwei Planeten" Heyne-Verlag

• 2002 Kurd Laßwitz prize for best envelope illustration. "Quest" Heyne-Verlag

• 2003 Kurd Laßwitz prize for best envelope illustration. "Jupiter" Heyne-Verlag

• 2004 Kurd Laßwitz prize for best envelope illustration. "Asteroidenkrieg" Heyne-Verlag

• 2006 Kurd Laßwitz prize for best envelope illustration. "Die Legende von Eden und andere Visionen" Shayol

• German Fantasy prize 2006