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    Mark Costley
Sleek, charming and irresistibly mysterious.
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| Played by | 
                                                     
                                                                                                                    Ben Chaplin
                                                                                                             
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With his direct gaze and expensive suits, there's a sleekness and confidence in Costley's movements, and a poise that Yvonne is deeply attracted to. When he gives Yvonne his full attention he is devastatingly charismatic and makes her feel like the centre of his world – however fleetingly.
Costley is married with young children, but he gives very little else of his real life away. Yet there is a real connection between these two; Costley ‘sees’ Yvonne – both physically and sexually, but also intellectually.
It is only much later that Yvonne begins to see the reality of their affair – as she discovers Costley’s true identity.