Translated from the back of the book:
"Plague aboard
'The Black Rage' is what they call one of the most terrible plagues known on Aventuria. So far only few know of the ship Searider laying on the quay with a sailor aboard infected by the Rage. Only a couple of hours remain before Havena will sink into panic and chaos... the city's safety is in your hands! Will you and your friends find the Searider's other sailors, before the Rage breaks out?
'The Black Rage' is just one of three exciting adventures of this module, containing among other things 10 maps and playable without the Havena box set."
Additional user summary
The other adventures in this module are:
"Auf Dracos Spur" ("On Dracos trail")
The search for runaway pet dog brings the heroes on the trail of Havena's thieves guild where they might discover the secret of a merchant's wealth.
"Das Experiment" ("The Experiment")
A ruthless scientist strives to complete his essay on fear by instilling panic in the entire city. The heroes must stop him before the first victims appear.