This CYOA is very nicely written with Inklewriter, which I tried out and gave high praise to. Inkle works well for moderate-sized conversation-based stories, and that's what this mostly is. A piece has gone missing from a code-breaking/encrypting machine and you might be responsible.
The bulk of the game is an interrogation, giving answers to questions that are posed to you. You often will get yes/no agree/disagree, often with a choice of lie/truth. The only downside to this is on your first playthrough you're the dumbest person in the room. Several crucial plot points are known to the protagonist and antagonist but the reader only learns what's actually happened after several random stabs at answering the questions. This is not an amnesia game, and the story does not shift based on your answers. It feels like a really good conversation section from a Mass Effect game if it were set in WW2. If this were an endgame to a slightly larger scenario it might not feel quite so trial-and-error.
I never did get the best ending, which might be a testament to the potential of inkle and CYOA, or it may mean that I tired out after giving the same sequence of yes-no-no-lie-yes-agree-yes-no to get to the part of the story that actually branches out and will not let you double back.
It's worth a try - I played this on a lunch break on my android device, and the text is very nicely formatted and readable with large finger-sized buttons for your choices.