Houdini's last magic trick

A mental magic trick you can perform with your phone The magician (you) shows photos of Houdini taken 100 years ago. He asks the spectator to look into Houdini's eyes and choose a card (a totally free selection). The chosen card is named, and the magician shows that in the same picture, Houdini's brother is holding a single card which is the chosen card. The application is full of information about Houdini, and looks like an ordinary app. The app contains instructions how to perform the magic.