Three tools, one case: the files you read, the timeline you build, and the notebook that keeps your thinking honest. Everything below takes two minutes to learn.
Each week a new episode drops: one folder of evidence, and a few questions to answer before the next folder opens. Case Files in the top menu takes you to the current case; each episode is its own page.

Every episode has an evidence desk: a grid of files. Photographs, reports, statements, phone records.


The case material is protected from copying. Select an exhibit's text, a transcript, a tip-line slip or a week's question and the copy comes back as a single line pointing at the site instead of the text itself. It is nothing personal: a case file pasted somewhere that will happily solve it for you stops being a case, and the season is built to be worked out rather than looked up.
Everything you write is a different matter entirely, and it always will be. Your notebook, your timeline, your theory and the answers you file are yours to select, copy and keep anywhere you like, including from inside a case file. If you keep your own notes somewhere else, nothing here gets in the way of that.
The week's questions stay locked until you have opened every file in the episode. A counter above the questions shows how far along you are. This is the game making sure you never answer blind.

A few more things you will meet on the desk:
Every card and every open file has a + Timeline button. Press it and that piece of evidence becomes an event on your timeline, already carrying the document's own date.

That timeline is yours: the next chapter shows how to work it.
The timeline is where you reconstruct the night: every event in order, each backed by the evidence that proves it. There are two views of it, and they are the same timeline.

Anything you add in one view is in the other. It is one timeline, sliced two ways. If you are signed in, it also follows you between your phone, tablet and computer.
Two ways:

You can also link an exhibit to any event with the dropdown at the bottom of the block, and jump back to that file with one tap.
The timeline keeps itself in date order. Two ways to override that when your theory disagrees with the paperwork:

Untick Override date at any point and the block snaps back to where its date says it belongs. Blocks with no date at all gather at the bottom until you give them one.
To remove an event, press ✕. To start over entirely, Clear all (it means it, so it asks first).

The Notebook, in the top menu, is where your thinking lives for the whole season: what the evidence proves, what you merely suspect, and the theory you would put your name to this week. If you are signed in it is saved to your account and follows you across devices.

Everything you write is stamped with the episode you were reading at the time, so you can watch your own thinking change as the case unfolds.

At the bottom, one theory per week. It defaults to the episode you came from; the week dropdown lets you re-read (or rewrite) an earlier week's theory. Nothing here is scored. It exists so that at the finale you can see exactly when you first got it right, or how confidently you got it wrong.

One honest warning, Detective: the notebook is only as good as the discipline between Facts and Assumptions. The case has a way of punishing people who file one as the other.