Possible Clues:

• Mishap — occurrence
• Happening
• Happening to be in depression east of Jersey and Guernsey
• What happens before the police have ten run in
• Event found ten in CID mix-up
• It happens that I make a hole in a hundred
• Violent event at home -- detectives sent but not first thing
• Confrontation in medical department needing police intervention
• Peace accord threatener
• Cited inn as source of happening