Cop by day/wolf by full moon. When werewolf police detective Joshua Hobbel is framed for murder, he must accept the beast within in order to stop the human monsters that surround him.

For your consideration:

When a cursed detective struggling to control his inner werewolf is framed for murder, he must unleash his inner beast to find the true killer or be lost to his curse forever.

Three words shorter,clarifies his dilemma, sharpens the hook.

Thanks Nicholas.

How about this:

As a cursed detective struggles to contain the wolf within, he suspects he is being framed for murder. To uncover the true killer, he must either accept the beast or be lost to his curse forever.

Hey mate - some thoughts on your logline.

Drop the "cop by day, wolf by full moon." Your audience knows how werewolves work, so you don't need to include that.

What I know from your current logline is that a detective, who is also a werewolf, is framed for a murder.

I don't know at all what happens after that (your I.I.). Does he try to clear his name? Does he try to catch the real killer? Both? Does he go on the run? Does he throw in with a bunch of other werewolves in order to wipe out humanity, so indignant is he of what the humans have done to him? What happens after the inciting incident, and what is at stake if he fails? That's what needs to go in this logline.

Your script may very well infer that humanity are monsters without any help from magical curses, and your hero's journey may require him to come to terms with his condition before he can complete his goal, but that's all subtext. Your logline should tell us "werewolf detective with flaw needs to achieve this goal, or else the thing at stake will/won't happen."