Is this a real ghost photo or a trick of the light?

As we approach Halloween, this scary photo taken in Lyme Regis Boys Club in 2005 was brought to our attention.

In front of the curtains and array of tents is what appears to be the figure of a child that almost looks as though it's floating.

Just before this photo was taken a two year old was seen talking to herself and when asked to whom she was talking with, she replied she was speaking with 'Sam'.

There wasn't anyone in the building named Sam. When everyone left, one of the adults took pictures with a digital camera and this spooky image is one of them.

Does it show a ghostly girl running into the room or is it the trick of the light or of Photoshop?

The building occupied by the Club was once the Parish Church Hall and was also used by the American Army during the Second World War. It was taken over by the Boys Club in 1978 and extensively refurbished in 1993.