Cambridgeshire, September 1813:

Detective Stephen Lavender and Constable Ned Woods are lured to an isolated estate in the deadly marshland surrounding Ely to investigate a murder.

But nothing is as it seems at the mysterious Willow Marsh Manor. They soon realise they've come across this feuding family before – in the direst of circumstances. With no dead body and no sign of the woman who summoned them, Woods fears someone has planned a murderous revenge.

Meanwhile, Lavender dreads the disclosure of his greatest secret. A secret that, if revealed, will destroy both his career – and his relationship with Woods.

Haunted by ghosts from the past, Lavender and Woods must tread a careful path through this watery and dangerous terrain in order to solve one of the most perplexing mysteries of their career.