A lawyer visits the Daltons in prison to explain that an uncle has
bequeathed a fortune to them, but that they will only have access to it
after shooting every member of the jury who sentenced him to hang - and
that in front of a very specific witness: Lucky Luke. One prison escape
later, the four brothers are riding hard with a list of men to kill -
and a more or less captive Lucky Luke intent on making their task
impossible...