Two children went into the sea. Only one came out alive.Introducing Sergeant Mike Adams and DS Sue Willmott, Beachbrook's best investigators.When local couple Andrew and Sophie take their daughter and her friend to the beach on a stormy day, they are momentarily distracted leading both children to get washed out to sea. Andrew dives in, but comes back ashore with only one child - his own daughter, Maria. Joe, the son of his best friend and local police officer, Chris, has drowned. But it was just a tragic accident...wasn't it?As Sergeant Mike Adams and DS Sue Willmott investigate what really happened in the water that afternoon, the ripple effects of the tragedy start to tear the community apart. The detectives must discover the truth before their colleague - bereaved and desperate father, Chris - takes the investigation into his own hands...