- AudiobookRupert Undercover. Ostfriesische Mission [Band 1 (Ungekürzt)]Rupert Undercover
- AudiobookSeries: Rupert UndercoverRupert Undercover
- AudiobookRupert Undercover. Ostfriesische Jagd. [Band 2]Rupert Undercover
- AudiobookOstfriesenfeteRupert Undercover
- AudiobookRupert Undercover. Ostfriesische Jagd. [Band 2 (Ungekürzt)]Rupert Undercover
- AudiobookRupert Undercover. Ostfriesische Mission [Band 1]Rupert Undercover
- AudiobookRupert Undercover. Ostfriesisches Finale [Band 3 (Ungekürzt)]Rupert Undercover