The plot had more holes than a swiss cheese
Let me start by saying that as a piece of entertainment it was ok, certainly nothing to stay in for, but if you want to fill an hour and a half of your time and don't have anything better to do such as clean the drains or delouse a rat then I suppose it's worth watching, however some of the gaping holes in the plot were infuriating, the two main characters come across as being pretty thick.
WARNING: SPOILERS
Hole Number 1
You're looking for your suspect and you find his secret lair (his clinic) do you
a) covertly stake it out and nab further suspects when they turn up ?
or
b) go blundering in with bolt cutters and get discovered ?
Hole number 2
A girl who holds a vital piece of the puzzle is rushed into hospital in an ambulance, she then absconds from said hospital and you have to find her, but you have no idea where she lives. Do you
a) Ask the ambulance driver for the address where they picked her up?
b) Give a sample of her blood to the police for them to search a DNA database and hope that she has a criminal record so you can get her address that way (some 12 or so hours later)
Hole number 3
You are a renegade scientist and you need to make a speedy escape do you
a) use a helicopter/fast car/motorbike ?
b) order yourself a black cab because there is no way that the police will be able to catch it, radio the driver, locate it on their inbuilt transponder or ask the driver where he dropped you off.
Actually now I come to think of it, maybe the drains do need looking at.