A cop must track down a violent criminal loose in the crime free society of 2050 and learns something about the killer that is set to change her and this utopian society. Psychological thriller.

All the elements are here to make up a great logline. I think that it may take you a few goes to get it right though.

Firstly, take out the ‘psychological thriller.’ If you’ve done your work properly with the logline then we should be able to work the genre out for ourselves.

Also i would suggest getting rid of the 2050. Unless this date is extremely important to the story, i think writing ‘in a future society’ should be enough.

Next, you’ve identified your protagonist,the cop. That’s good. I always suggest giving them a flaw if possible. It could be something as simple as ‘a nieve’ cop. This automatically presents the story with so many more options then simply stating that he’s a ‘cop.’

Next, this is the big one, make his goal clear. The logline should almost always end with a statement of what the goal is. You kind of have that here. I would suggest changing up the order to end on this goal, it makes the story much easier to read.

And finally include the inciting incident. When does he start going after this killer? Why does he start going after this killer? What gets the story going.

An example of how I would re-write this logline (based off the info you’ve given provided” would be –

“Set in a future society, when the first murder in a generation takes place, a nieve cop must stop the killer from striking again before the structure of this Utopian society crumbles”

hopes this helps