You are on the train home and a stranger gives you her baby to hold whilst she takes a phone call. You watch her walk down the corridor, coo over the baby and then see the same woman walking down the platform and through the barrier. Do you call the Police or take the baby home? Well the latter is what Ellen did. It's the best thing I've read in a long time. So suspenseful and well written. The characters Ellen and Mia, the baby, are instantly built and likeable. I hope it ends as well as it started.