At 31 words, this is a much better logline. The private investigator is in the driver’s seat of the plot, as he?should be, and the stakes are personal, not just professional.

I’m presuming that the AI murder takes place in a world where Isaac Asimov’s laws of robotics are coded into?AI’s programming, the first law being “a robot may not injure a human being or, through inaction, allow a human being to come to?harm.” Which certainly would deepen the mystery. ?Assuming that to be the case, I reworked to something like:

In a futuristic world, a private investigator drug must partner up with an android detective to solve?the mystery of why and how his sister induced an AI to override its programming and murder her. (36 words)

“In a futuristic world”: To obviate the possibility of some logline readers tripping up over the concept before?they’ve read all the way through, I think it is prudent to make explicit what is implicit.

“Drug-addicted”: ?Optional. The dramatic?reason for a character flaw is to ?raise dramatic tension in meaningful relation to the ?dramatic problem, in this case the murder, and to the protagonist’s objective goal which is to solve the mystery.

By meaningful relation I mean that ?the flaw is, in some respect, 1] a symptom of the overall dramatic problem AND 2] theme AND ?3] the flaw will frustrate and defeat the protagonist’s purpose ?unless/until he overcomes it. ?Point 3] means that it is implicated in the end of 2nd Act “Darkest Hour” crisis: either he finally ?kicks his habit or else he is doomed to fail.

“Estranged”: Keep it in the story, of course, but is it really essential for the logline? Really?

While the standard formula is to lead with the inciting incident– and that usually is the best way– there are good?reasons for occasionally tacking it to the end. One reason is economy of words. “When his estranged sister is?found dead, ” and “why she ordered an AI to kill her.” overlap. Another reason is to improve word?flow, avoid an awkward reading experience.

Finally, the twist in this logline is not that the man must partner up with an android, but that his sister?persuaded an AI to violate it’s programming and kill her. And twists work better at the end than the beginning of a sentence; the?logline sort of ends with a ?punch line.

Anyway, I think you have a strong concept. Best wishes with your writing.

fwiw.