Always good stories from this site and this story is no different. But wonder how he is going to pull it off. The husband is always the first and primary suspect, even if she is found. And if her AP was also missing, the police would have a field day. Good luck with that.
Spoiler Alert... Oh... this story could have been sooo much longer... Married a reformed serial killer... Had a child together... Then lied and cheated on him... And awoke his Bad side... Only to realize he probably knows where to hide all the evidence... Bravo... Bravo... bravo... Oh how I love a revenge story...
Some people take betrayal personally. Some people, once motivated are all-in and capable of anything. OP is both. I find myself hoping that he is clever enough to pull it off - just because his enemies are so culpable. It would be tough to pull off though so he would need to up his game from prior cluelessness.