ThesecondseriesofAftertheFloodfindsnewlypromoteddetectiveJoMarshallonthetrailofabafflingmurderinvestigation.AstensionssimmerinWatersideamidtherisingthreatofmoorlandfiresandthesubsequentriskoffurtherflooding,abodyisdiscoveredinbizarrecircumstances.Jo'sracetostopthekillerwillputherinoppositiontodark,influentialforceswithinthetown,andultimatelytakeheronamuchmorepersonalinvestigation.Onethatwillrequirehertooperateinsecretifsheistohaveanyhopeofrootingoutthecorruptionthathasblightedthetown'spoliceforce-andherownfamily-fordecades.