The Copper, or The Grasper (German: Der Greifer), is a 1930 British-German crime film directed by Richard Eichberg and starring Hans Albers, Charlotte Susa, and Margot Landa.

Scotland Yard's Sergeant Harry Cross is investigating a brazen robbery at a London mansion in which the guests at a large dinner party were robbed of all their jewelry and valuables.

Cross then threatens nightclub owner Snorry to raid and shut down his joint if he doesn't name the knife thrower by the following night.

At Scotland Yard he meets Alice, Cross's wife, who reacts a little jealously to her husband's professional acquaintances with women.

Cross now suspects that another robbery by Knife Jack's gang is to take place during the revue performance in the Coliseum Theater that evening.

After a brief singing performance and another jump into a box where Jeff and Dick are waiting for the robbery to begin, Cross is able to thwart the criminals' plan.

In a side room, Sinclair and Alice meet Josef Huber, who discovered Knife Jack's identity during his assignment in the Palermo.

The employees of the Palermo unanimously claim that Josef Huber left the room and the nightclub, albeit heavily intoxicated.

Cross believes the arrest to be a gross tactical error and asks Warrington for complete freedom to solve the case.

Arriving in the basement of the closed Palermo nightclub, she finds Jeff, Dick and Knife Jack, whose identity is initially hidden from the viewer.