Murder on the Oxford Canal

Meet DI Hillary Greene, a police woman fighting to save her career.
Not only has she lost her husband, but his actions have put her under investigation for corruption.
Then a bashed and broken body is found floating in the Oxford Canal. It looks like the victim fell off a boat, but Hillary is not so sure. Her investigation exposes a dark background to the death.
Can Hillary clear her name and get to the bottom of a fiendish conspiracy on the water?