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.

Gillian Anderson

Stella Gibson

Jamie Dornan

Paul Spector

Niamh McGrady

Danielle "Dani" Ferrington

John Lynch

Jim Burns

Colin Morgan

Tom Anderson

Stuart Graham

Matthew "Matt" Eastwood

Valene Kane

Rose Stagg

Bronagh Waugh

Sally Ann Spector

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