Totally torn about what to do. I recently caught my boss out falsifying business data. She knows I know. She did it thinking id never find out. I didn't suspect a thing - I just stumbled across it by sheer chance. She is very senior, I'm reasonably senior and there is a good chance she could lose her job. I shouldn't know but I do know that she's already under investigation for something else that calls her character into question (financial wrong-doing) but I don't know what the outcome of it has been or whether it's still ongoing even. Every scenario is shit. I say nothing and feel compromised. I say something and she's sacked or disciplined and I have to carry on working with her. I say something but nothing is done about it, so we carry on working together with our relationship broken. She's lovely, a great boss and a likeable human being. My OH thinks I have to report. A colleague I've confided in says she's under a lot of pressure (she is), we all make bad calls and so let it go.