Der Alte ("The Old One" or "The Old Fox") is a German crime drama series created by Helmut Ringelmann.

Humble and unassuming in appearance, chief detective Köster is the "Old Fox".

By understanding the psychological make-up of his suspect, the "Old Fox" craftily leads the criminal into his own trap, to the great surprise of his often perplexed staff.

Wearied by the negative elements he has witnessed so often in society, the "Old Fox" provides a unique insight into human nature.

The actors or actresses of other assistant characters over the years include Jan Hendriks, Markus Böttcher, Marlene Morreis, Pierre Sanoussi-Bliss, Ludwig Blochberger and Stephanie Stumph.