Griff Hendry knows what it is to be strong. After a turbulent past, he's dedicated himself to saving lives, working as a coastguard along the breathtaking shores of Dorset. It's Griff's belief that everyone is worth saving - which is why he can't forgive his father, Logan, for what he did. Griff's future is plunged into uncertainty when his wife, Evie, tells him she wants a separation. The revelation is a shock and leads Griff to question what Evie could possibly be hiding - and she isn't the only one holding back. Griff's troubled stepdaughter, Tess, also harbours a dark secret. As the truth is uncovered, Griff is forced to accept that perhaps he's never understood what real strength is.