DCI Vera Stanhope finds herself drawn to the enchanting tidal island of Lindisfarne, where a group of lifelong friends reunites every five years to commemorate their enduring bond. As the tide rises, long-concealed secrets begin to surface, threatening to engulf everyone involved. Vera, aided by her trusted and resourceful team, including Detective Sergeant Aiden Healy, navigates treacherous waters, facing danger and deception at every turn. Together, they must unravel the twisted web of lies before another tragedy unfolds.