Do 1 playthrough at a time. When you finish a playthrough, CLOSE THE GAME AND REOPEN IT. After that, start a NEW GAME every time. This game has issues when it comes to remembering your choices from previous playthroughs.

If the game stops at every decision and at every investigation, then you should be fine.

Other Note: On your subsequent playthroughs, you may notice that the game starts to be unskippable again. Unfortunately it's a bug and only an investigation will fix it.

START
Started a New Game

I wouldn't. You're more my type.
Investigation #1: Questioning the Band
Investigation #2: The Bar
Investigation #3: Adam at the Coffee Shop
No Thanks
Yeah!
Not really...
Yeah!
Yeah!
Investigation #4: Jack's Office
Investigation #5: Questioning the Band #2
Investigation #6: Questioning Jack
Yeah!
Investigation #7: Questioning the Band #3
Investigation #8: Items of Interest: The Van
Investigation #9: Questioning the Band #4
Yeah!
Investigation #10: Questioning Jack
Sense of Humour
Date Night with Laura
Went on a date with Laura


Investigation #11: Items of Interest: Warehouse Storage
Investigation #12: Items of Interest: Warehouse Cell
Wedding Bells
Reached the end with Laura

Not Exactly
Investigation #1: Questioning the Band
Investigation #2: The Bar
Investigation #3: Adam at the Coffee Shop
Why Not
No Thanks
Not really...
No plan...
Not really...
Investigation #4: Jack's Office
Investigation #5: Questioning the Band #2
Investigation #6: Questioning Jack
Not Exactly
Investigation #7: Questioning the Band #3
Investigation #8: Items of Interest: The Van
Investigation #9: Questioning the Band #4
No plan...
Investigation #10: Questioning Jack
Confidence
Date Night with Li
Went on a date with Li


Investigation #11: Items of Interest: Warehouse Storage
Investigation #12: Items of Interest: Warehouse Cell

Amsterdam
Reached the end with Li

I wouldn't. You're more my type.
Investigation #1: Questioning the Band
Investigation #2: The Bar
Investigation #3: Adam at the Coffee Shop
No Thanks
No Thanks
Why Not
No plan...
Yeah!
Investigation #4: Jack's Office
Investigation #5: Questioning the Band #2
Investigation #6: Questioning Jack
Not Exactly
Investigation #7: Questioning the Band #3
Investigation #8: Items of Interest: The Van
Investigation #9: Questioning the Band #4
Yeah!
Investigation #10: Questioning Jack
Confidence/Sense of Humor (Doesn't matter anymore)
You should get a scene where Chris has the day to himself and neither Li nor Laura call you for a date.
Investigation #11: Items of Interest: Warehouse Storage
Investigation #12: Items of Interest: Warehouse Cell

She didn't like you anyway.
Reached the end with Chris

The investigations can't be failed, but in case you're stuck, here's this.

Questioning the Band
Investigation #1: Talk to Li about how Adam got her the gig.
Investigation #1: Talk to Joe about how they knew each other.
Investigation #1: Talk to Laura about it might be more basic than that.
Investigation #1: Talk to Laura how it could be about money
Investigation #1: Talk to Li how he really just wanted her

Items of Interest: The Bar
Investigation #2: The Knife on Stage
Investigation #2: The Pill Bottle at the Bottom
Investigation #2: The ad on the billboard behind the bar

Talking to Adam at the Coffee Shop
Investigation #3: Contract --> Ad --> Pills

Items of Interest: Jack's Office
Investigation #4: Photo on the desk (click twice)
Investigation #4: Divorce Lawyer Card under the monitor
Investigation #4: A4 Double Order Sheets
Investigation #4: Knife under desk
Investigation #4: Top cabinet under the Printer

Questioning the Band #2
Investigation #5: Talk to Li suggesting how it could be anyone at the venue
Investigation #5: Talk to Joe about how Sammy mentioned Jack going through a divorce
Investigation #5: Talk to Joe about how Jack has a thing for knives

Questioning Jack
Investigation #6: Memo --> Jack Photo --> Business Card --> Order Sheet

Questioning the Band #3
Investigation #7: Talk to Laura about it being either Jack or Lloyd

Items of Interest: The Van
Investigation #8: The chain link to the right

Questioning the Band #4
Investigation #9: Talk to Laura about how Jack is a better fit
Investigation #9: Talk to Joe about how an argument doesn't lead to murder
Investigation #9: Talk to Li about how there's not enough time for the murder and to clean out the van

Questioning Jack
Investigation #10: Lloyd's Statement --> Lloyd's Statement --> Chain --> Fez Club

Items of Interest: Warehouse Storage
Investigation #11: Blood near the wall
Investigation #11: Blood near the middle
Investigation #11: Razor blade near the wall
Investigation #11: Grey box on the far left shelf, middle box.

Items of Interest: Warehouse Cell
Note: Nothing actually required
Investigation #12: Day Tallies on the Wall
Investigation #12: Chains
Investigation #12: Pipings
Investigation #12: Toilet
Investigation #12: Window
Investigation #12: Bucket under Sink
Investigation #12: Darkened brick under sink