"Oh, go on then!" Gwen winked. She ushered Anna and Jack onto the step and jumped up after them.

She wrapped her arm around Jack's and smiled at him. "Hang on, this might feel a bit strange." Of course, having just been swallowed by a rift in time and space and plunked into a Cardiff alleyway was strange, but it's all about perspective.

The step gave a small shutter and began its decent.