In several ways, McEwan's second novel seems to follow on from his first, The Cement Garden (1978), about a family of children living alone after the deaths of their parents. The central couple of The Comfort of Strangers (1981), Colin and Mary, are so close they could almost be brother and sister, and they sometimes find it difficult to remember they are separate people. Holidaying on the continent, they sleep in the afternoon, communicate without talking, and do not even have the energy or motivation to tidy their hotel room. They revert to a child-like state, dependent on their hotel maid: “they came to depend on her and grew lazy with their possessions. They became incapable of looking after one another.” …
Childs, Peter. "The Comfort of Strangers". The Literary Encyclopedia. First published 08 January 2001; last revised 30 November -1.
[http://www.litencyc.com/php/sworks.php?rec=true&UID=1228, accessed 27 April 2015.]