We just had a lovely weekend away, and drove back to London, in heavy traffic, in time for tea. The trouble was, Emily and Harry were so worn out from all the fun that they slept most of the way back.
Roll on to bedtime, and Harry can't sleep. An hour of requests for a cup of milk, a footstep here etc etc, and suddenly it became a little sob from the top of the stairs, so I went up.
There he was, sitting on the step with his two photographs of Jessica laid neatly side by side; the ones that travel with him, and always sit beside his bed.
'I just want to talk about Mummy.'
'OK darling, of course we can. What would you like to talk about?'
'Why did Mummy die? What is an infection anyway? Why do people die too early? How did the doctors know she was dead?'
I tried to field the questions as best I could, in suitable language, without causing extra alarm, worry or distress, but still they came.
'What medicine did they give Mummy? How did she actually die? What other question would be a good one to ask, Daddy?'
I can't lie to Harry about what happened, he has a right to know. But not at six years old, surely? I can't even tell him that all of the answers lie in four lever arch files, each three inches or so thick, full of medical notes, charts, statements, legal and medical analysis and argument - he'll want to read it, and then he'll get angry when I don't let him.
All I can do is promise him that the doctors did everything they could to save his Mummy, after she was admitted to A&E and once in Intensive Care. This reassures him, even if his curiousity isn't satisfied.
One day he's going to ask about before she went to hospital, and he's going to be so angry.
'There's nothing we can do to bring Mummy back, Harry, but that doesn't mean we have to like it.'
'What's Jessica's trust, Daddy?'
'It's Daddy's work - trying to stop other Mummy's dying like yours did.'
'What is child fever, anyway?'
'Childbed Fever? It's what Mummy died of. It's an infection that can kill you after you have a baby.'
'Why Daddy? Why did God want Mummy to die? He controls everything, so he shouldn't have let her die.'
I wish I knew all the answers, like Harry expects me to.