Der Zinker (To Squeal) was based on The Squeaker, a mystery play by Edgar Wallace. The hero is a Scotland Yard detective who poses as an ex-convict. It's all part of a strategy to capture a notorious and elusive fence known as "The Squeaker," who cloaks his criminal activities behind a facade of charitable respectability. Evidently, this German adaptation ran far afield of the Wallace original, since its plot was disjointed and its character motivations unbelievable. An English-language version of The Squeaker, directed by Wallace himself, was released in 1930. ~ Hal Erickson, Rovi