1940s: Young and romantic, Veronica cannot help falling in love, even with unattainable men like handsome film star Jack Bannock. Her other passion is St Elfwy, the windswept jewel of an island off the coast of Pembrokeshire. It becomes her retreat, a refuge from war and a place to recover from lost love. But even peaceful St Elfwy cannot prevent tragedy and heartbreak.

Present Day: When Romy arrives on St Elfwy, now a bird sanctuary and retreat, she only has the enigmatic warden for company. As she devotes herself to understanding the lure of this beautiful, haunting place, she is drawn into the past and the tale of Veronica Mindenhall. The island hides stories of betrayal and loss, as well as redemption - but it is a perilous path to discover its secrets.