Good morning! I believe I can help you.
That is a terrible shock. I am so sorry this happened to you. Believe it or not, you can still pursue a Petition for Divorce. What you will do is pursue a default judgment (which is what is awarded when the other party doesn't show up for court).
I know you don't know where she is, so notice is a problem. However, if you show the court that she has disappeared and you've made reasonable efforts to find her, the court can allow you to pursue notice by publication, which is where you simply put a legal notice in the appropriate newspaper or legal journal. Of course, the reality is she'll never see it, but you can show you did what you could to let her know what you were doing and that will keep her from trying to vacate the judgment later on the grounds that she wasn't given an opportunity to be heard.
Clearly, this is an unusual situation and you won't want to try this by yourself. Talk to a local family law
attorney and explain your situation. He can then pursue what is necessary to get the judge's permission to pursue without your wife signing off. Since it won't be a drawn-out, contested matter, an attorney won't be too expensive and you can have the peace of mind that things were done right this time.
Best of luck! If I helped, please click "accept." Thanks!