This was a black and white film (I think) and it revolved around a private investigator hired by a woman to track down her long missing sister. The last anyone saw her was when she went to a pub with her boyfriend and following an argument, she stormed off home.

On her way she had to pass by a canal and it was later discovered that the local beat bobby at the time had murdered and buried her underneath the floor of an abandoned flower shop.

The private investigator got into so many scrapes trying to solve the mystery and did, while in a wheelchair and suffering from many broken bones.