Meh, what is this weird pride I see here and there with "when I was 10" whatever.
That you did doesn't make it a good suggestion anyway, and I don't mean that reading isn't a good suggestion.
But you should consider an uncle is asking suggestions of something to give as a gift to 10 years old niece.
If he gives her something that (most kids these days) would not want to engage with, well she will not be very happy.
In the other hand if he gives her something full of weird killing, yanderes and on top sexual innuendo, hmmm... her parents may night be quite happy about it.
So better save the poor uncle that problem and give a suitable suggestion.
In fact, you don't need to take my word regarding if it is a good suggestion, just ask the ESRB if you don't trust my judgement:
EDIT: In the other hand I think Phoenix Wright or Professor Layton would be ok for a 10yo, my non-recommendation for Zero trilogy doesn't come from the big amount of text actually, it is based on the same reasons the ESRB gave it an M.