Martha and her brother James have received an inheritance from their grandparents. It is the property of their grandparents and this inheritance has come in really handy - this place will be their home from now on. Martha and her brother, James, are moving in to their grandparents' renovated home. It's a thrilling process, and it's about to become even more exciting. In this case, it is not just about a simple move. Yes, that's part of the process that needs to be done, but there's more. Their grandparents left them a hidden note in their will, hinting at secret gifts locked away in their old storage unit. This sounds like the beginning of an interesting adventure, and the grandparents found a really interesting way to stay in the minds of their grandchildren as long as possible. Martha and James love a good scavenger hunt, so off they go to the storage unit to discover what their grandparents have in store for them.