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Owen was already on the bus when he thought of the front door . He had pulled it shut , but he could not remember turning the key . His bag was on his lap . His keys were in it . The door was back at the flat , and the bus was not going to turn around . He wanted one thing before he reached work : to know the door was locked . He took out his phone and opened the app for his house . The app asked for his code . He typed it . The lock on his front door is a small connected lock . It joins the Wi - Fi in the flat , and the app reaches it over the internet . People call a network of objects like this the Internet of Things : everyday things , such as a lock or a lamp , that can receive a message over the internet . The screen showed his door . Under the picture was one word : unlocked . Owen sat up . He had left it that way . He tapped Lock and watched the word . The phone sent the message . At home , the lock got it through the router . He could not see the door from the bus , but the word on the screen changed . Unlocked became locked . He looked again . It stayed locked . A lamp in the hall sat in the same app . That bulb is on the Wi - Fi too , so he can switch it from the phone . In the little picture the hall was already bright . He left the lamp alone . He had not opened the app for a light . He had opened it for the door . Some locks answer only when you stand beside them . His can take a message through the home Wi - Fi , so he can reach it from the bus . He still carries a metal key . If the Wi - Fi at home stops , or the phone battery dies , that key turns the same lock . The app is a second way to close the door , not the only way . The bus slowed for his stop . Owen put the phone in his pocket . He did not check the screen again . He stepped down with his bag . The door at home was locked . That was the thing he had wanted when he sat down .
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