Following on from the gripping thread, trying to identify the children's book with an elephant, I'm hoping you can all help me with my missing book!
It would be for an older child, a story about a boy who goes on an archaeological dig with his (step) father, and the boy finds a mummy of a child, covered in a gold mask and 'suit'. Possibly Inca?
In the middle of the night, the boy strips the mummy, and puts the gold 'suit' on underneath his clothes. He then takes an airplane back home, and hides the golden mask and suit in some caves near to his home. I think this was to prevent his stepfather from finding it. It ended up having a chase through the caves. I can't remember the ending 
I would have read it in the late 90's, paperback.
Please help!!!