i read this part, i know who was the one that he use it, i know when he use, i never told anything about this, i didn't told about it because it was a good idea, the wiretap was okay, but so what?
i was focused on their conversation on the train because this is the part that didn't make any sense for me. Is hard to believe that the MC was planning a trap, when himself was thinking "i should try to impress her more with the detective stuff, imagine if i turn out to be the hero who solved the case at HER church, she'd be totally hooked! who knows i might even GET LUCKY WITH HER, damn she's really quite a sweet delight, especially with tears weiling up on her eyes" well, that's really 15 steps....15 steps of kamasutra....
looks like he was lucky, lucky that his trap worked, and not that he actually planned it, because there was so much to go wrong, that the game could have ended right there, if the superior mother had been cautious instead of proud, she could have have fooled him easily, she already knew he was a detective, she didn't need to go to church with him, he only found out that she was the superior mother because she went along and the nuns told him, but she could have left, she already knew that he was a detective, she already knew what case he worked on, while he only had one suspect "assuming that he suspected"... she could easily left and make a plan to kill him. That's the point, so much could go wrong that it's convenient that his plan worked. He give her so much information, that if she intented to kill him, she would..