WARNING: This programme contains a sequence of flashing lights which might affect customers who are susceptible to photosensitive epilepsy. When a young brewery boss is found dead, a chain of events is triggered that draws four of his employees; Anna, Nancy, Louie and Cat - into a fragile pact of silence, bound by a secret that will change their lives forever. Anna's police officer husband Max investigates Jack's unexpected death alongside his fierce superior DS Holland, unaware that his own wife and her best friends are at the heart of a conspiracy. While brewery worker Tish becomes increasingly suspicious of her co-workers, Jack's estranged father Arwel struggles to conceal dark family secrets. What really happened that fateful night?