Alice’s mum returns, and I show her where she can wait with Alice. It’s the nicest part of the paediatric unit, with PVC-upholstered benches for parents and boxes of toys for children. As soon as she is freed from her buggy, Alice toddles off in her bright play dress to the toy oven, to make pretend cups of tea and bake pretend cakes, helped by her mum, who kneels beside her.

Trudy is preoccupied at the other end of the desk. The buzzer goes, signalling the arrival of a new patient. The last thing on Trudy’s mind is me – she has way too much to do, hitting the button to release the door lock, then signing in a little boy and answering his parents’ anxious questions.

I shouldn’t do it. I know it is irrational. But that eye. I have to check. A few keystrokes, and I have Alice’s computerised records on the screen. The address is on a very expensive street. When I see that her mother’s name is Eliza Wilmot I get an electric shock and my heart starts to beat faster.

Eliza was the name of a woman I glimpsed with Zac in a hotel bar on a horrible night two years ago. I never learned her surname. Is this the same Eliza? And the child. Could she be Zac’s? I shake my head at the possibility, then stop myself, self-conscious, though when I look around nobody is paying attention.

When I see that Alice was born on May eighteenth, just a few days after my own baby, I take a short, sharp breath. My throat tightens, and I am in the grip of grief and panic. There is a real risk I will cry. Last year, on May fourteenth, I pulled the comforter over my head and didn’t get out of bed at all. I think of my grandmother’s photo in the paper. Has Zac managed to find me, and dragged along a child I never knew about? The coincidences are too strong for me to imagine anything else.

I press on through Alice’s referral letter and medical notes. She has type I Waardenburg syndrome, which is a rare genetic condition that can cause hearing loss as well as changes to the pigmentation of the skin, hair and eyes. So far, the medical notes say, Alice has three manifestations of the condition. The white forelock, the iris that is segmented into two different colours, and eyes that appear widely spaced, though in Alice the latter manifestation is so subtle I hadn’t noticed it. She is new to the area, and today is her initial appointment with the paediatrician who will be monitoring her. Tomorrow, I see, she is going to audiology for a hearing test.