
Here's a rough translation of the summary from Bing:
Nine dead, nine seconds, one weapon: a survey to the tunes of 'déjà vu' for the Inspector Wonderball, the more misaligned COP in San Francisco. At the crossroads of XIII and Dirty Harry, the new signed police series Pecau and Duval, with Colin Wilson in the drawing.
A small summary: San Francisco, 1983. A mass killer kills 9 people from the roof of a busy street. The Inspector Spaddaccini, nicknamed by fellow Wonderball because treats it eats all day long, is responsible for the investigation. The speed of the killer reminds him of a folder that has marked his career: the assassination of Kennedy. The opportunity of a walk in the past, San Francisco freak and toxic of the 1960s and 1970s
Thanks to
Eurocomics USA for finding this, well worth following them.