‘I’m sorry, sweetheart, I’ve had an awful day.’ ‘What’s up?’ ‘She doesn’t want to sleep at all. She’s been awake all day, every single minute since five this morning.’ Dexter puts one fist on his hip. ‘Well sweetheart, if you gave her the decaff, like I told you …’ But this kind of banter doesn’t come naturally to Dexter, and Sylvie does not smile.