Jail Break!
From Arkham Horror Wiki
Jail Break! is a mythos card. It first appeared in the Innsmouth Horror expansion.
Card Information
Mythos Type: Headline
Gate Opens: Marsh Refinery
Clue Appears At: *Y'ha-nthlei
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Mythos Ability: However, it appears that whatever was being held in the jail wasn't quite human, so 2 monsters are released into the Church Green streets.
