Lisa takes Murray out for a walk and returns with a dog that obviously isn't him. Meanwhile, Paul and Jamie contact the cops and everyone else joins in the hunt for the real Murray. When they finally find him they also encounter people that own the dog Lisa brought home that turn out to be totally different than them.

The Buchmans find letters written by former tenants of their apartment chronicling a World War II love story that Jamie feels parallels her and Paul's.

Jamie is suffering from sleeplessness because she drank four cuffs of tea full of coffeine while learning for a test. All furious, Jamie urges Paul to spend the night awake with her that leads them to an all-night adventure in the building, from the basement to the rooftop, which ends with a tango together with John Astin, if that's who he really is.

Mr. Wicker goes out of town and asks Paul and Jamie to tend his rooftop garden. Mabel loves another baby's rare toy.