Liam O’Grady did not waste any time.

He contacted the people who could help him, men who owed him and was able to lay his hands on the recordings from cameras on the way. The cameras overlooking the park, the ones in the shops, all of them proved helpful. Once it was a glimpse, another time, a hurried glance of a figure in a long coat, despite the warm weather, and then, in one single frame, the face, turned for a split second. But enough to reveal the face mask hiding the lower part ...