Fenland noir

You never know what the river will wash up but I think it has excelled itself this time. 
MrsW and I are addicted to Scandi- noir films so we can imagine the conversation at the local police station. 
" Well sarge, it's a tidal river so the body could have been ditched upstream near Ely or down by the river mouth near Kings Lynn, it's anybody's guess at the moment." 
"Ok constable, just keep me abreast of your investigations."