Cora Buhlert 
The Milk Truck Gang [EPUB ebook] 
An Adventure of the Silencer

Upstate New York, 1937: When the delivery vans of the Daisy Chain Dairy Company are targeted and robbed by a criminal gang and a driver is shot, Richard Blakemore a.k.a. the masked crimefighter known only as the Silencer decides to get involved.
So he stakes out the dairy company in the early hours of the morning to apprehend the criminals, only to find himself embroiled in a lethal fight on the bed of a speeding milk truck…
This is a short story of 3700 words or approx. 15 print pages in the Silencer series, but may be read as a standalone.