Guessed the twist early (here's how)
A trope of these movies is to have the kidnap victim speak to the protagonist over the phone. The whole "I need to know he/she is still alive, or else i'm not doing anything you say"
The fact you never once hear the daughter on the phone, coupled with the fact that it is the wife who "speaks to her" on the phone, and not Gerard Butler, gave it away.
I knew she was in on it from that point on.