tiny apartment, kate's bulldog key chain, the one she'd gotten in moscow. ethan said heather took it from kate's purse as a memento. she was telling them the truth. so they decided next morning first light armed with andy's google map and more detail from heather, the team would return to the island. >> you know, all that we were believing was coming to fruition. all our suspicions about her activity and mack's activity, at that point we knew we had the right people. >> one thing. they'd be going without police. good idea? maybe not. coming up, the a-team under arrest? >> you were arrested? >> we were not free to leave. they made that clear. >> this was a twist even they didn't see coming, when "strangers on a train" continues. continues.