So I'm running MoN and my investigators ambushed
Everybody's hands are dirty. If they didn't shoot somebody, they used their knife to coup de grace. I gave them 6 rounds until the bobby's started blowing their whistles then another 2 before they start showing up. However two of the PCs started searching through the shop while the other two wen to hunt down G. To make a long story short, after a few failed Luck & Fast Talk Rolls, the party has been arrested. After being caught with illegal firearms, bloody clothes, stolen artifacts, it doesn't look good. Oh and G is a witness to the murder by these American & German foreigners.
What I'm looking for is a scenario set in a Jail or a Sanitarium (because the Investigators keep saying that G is part of a death cult and used magic on them). Hopefully a scenario that the ending is them escaping and can be done in one night. I don't want to deal with legalese protocol of 1920's London. Especially since one of my players is an attorney. Or any other suggestions would be nice.
I do want to penalize them a bit because one investigator goes out of his way all the time to find a gun and has a very shoot first mentality (we all primarily play Pathfinder/D&D but have spent a year playing CoC). It seems like any cult leader/wizard is paper compared to 3 shots from a gun. Since we are using Pulp/Luck rules, I always have to drain the leader's Luck to get into the second round. Or am I missing something?
Thank you ahead of time for your recommendations.