When the Police Service of Northern Ireland are unable to close a case after 28 days, Detective Superintendent Stella Gibson of the Metropolitan Police Service is called in to review the case. Under her new leadership, the local detectives must track down and stop a serial killer who is terrorising the city of Belfast.

Marcy, a worker in the reelection campaign of bumbling Senator John McGlory, is sent to Ireland on a quest to find the Irish ancestry of Sen. McGlory, to help him win the Irish vote. But when Marcy arrives in the small village of Ballinagra, she finds herself in the middle of a matchmaking festival, and the local matchmaker is determined to pair her off with one of the local bachelors.