London at the dawn of 1918 and Ireland's most famous literary figure, WB Yeats, is immersed in supernatural investigations at his Bloomsbury rooms. Haunted by the restless spirit of an Irish girl whose body is mysteriously washed ashore in a coffin, Yeats undertakes a perilous journey back to Ireland with his apprentice ghost-catcher Charles Adams to piece together the killer's identity. Surrounded by spies, occultists and diehard female rebels, the two are led on a gripping journey along Ireland's wild Atlantic coast.