Post History
In my opinion, if it was clear that you wanted the reader to be unsure, then there is no problem. For example, if Olivia did not always answer right away when someone said "Olivia!" then you are ...
Answer
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/30953 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
In my opinion, if it was clear that you wanted the reader to be unsure, then there is no problem. For example, if Olivia did not always answer right away when someone said "Olivia!" then you are being fair. Or if she thought _Dang, it's hard to remember to answer to that_ (although that's a little too obvious). But, those sorts of clues. Then I know that it's not Olivia, and I get to guess who it is. I am happy if I guess right. If I guess wrong, but the game was well played, I am still satisfied.