 In Chicago, the lonely architect Alex Wyler has a troubled relationship with his father Simon Wyler. In 2004, he buys an old glass house in a lake, designed and built by his father, and he finds a message in his mailbox from the former tenant, the also lonely Dr. Kate Forster, asking to deliver her correspondence in an address downtown. Alex meets his brother Henry in Chicago and when they go to the address with Dr. Forster s correspondence, they find a building of luxury apartments under construction to be delivered eighteen months later. After some messages, Alex and Kate disclose that she is living in 2006 and Alex in 2004, they fall in love for each other and they try to find means to meet each other.