This had to happen. Walter had been able to keep all the balls in the air for just about everyone. But when a single lie got under Skyler's hide, she became suspicious and began to check on things. Once Columbo suspects you did it, he would be relentless. It's easy to find evidence when you are sure of the conclusion. Two focuses here. Jesse is inconsolable and Walter feels responsible for it (actually he is but wouldn't have had to worry if the girl wasn't bad news). Then Junior starts with the Pay Pal thing, exposing Walter visually. Then, of course, there is the surgery to make Walter White well again. What a great conclusion to the season!
