After blowing the whistle on a colleague, Detective Grace Narayan is sent to a small Welsh Island, she encounters local GP Doctor Pridaux, who explains that his son Cai vanished a year ago, the investigation proved fruitless.
An identification is made of the body, Grace is keen to prove it was murder, but a Murder Investigation team arrive from the mainland and take over proceedings.
A huge storm hits The Island, forcing Grace to spend time with all the locals under the same roof. Grace continues to investigate Cai's death, Silas provides an interesting lead, The True Way.
Grace is adamant that Gruffudd is somehow involved in Cai's death, she tries to get to him, through Minh. Doctor Pridaux provides Grace with a credible lead after spotting a detail in the photograph.
Owen and Winter think they're helping the case, by conducting an illegal search of Gruffudd's house, their actions prompt an angered response from an exhausted and unwell Grace.
Grace learns exactly what's happening on The Island, all of the questions that she had about The True Way are answered. The murderer is brought to book.
