Carol Vyner meets travel agent Harry Brent, and although she knows little about him she breaks off her engagement to Det. Insp. Alan Milton. When someone close to Carol is murdered, not only does it appear to Milton that Carol and Brent are implicated but there is a key puzzle to be resolved - who exactly is Harry Brent? Also included is the alternative ending written especially for German television. Francis Durbridge is to tv and radio what Agatha Christie is to the novel - the master of the unexpected twist. Malcolm Moore