The lost loot of Lima

For ten-year-old Benjamin being a treasure hunter is great. Learning he is a pirate, that's even better. Ben discovers a treasure map left by his grandfather and embarks on one last treasure hunt with the help of his Nan. But does someone else know about the location of the treasure? Ben must face danger and use his wits, or risk losing the loot forever. But more importantly, Ben must deal with his grief and say goodbye to his treasured grandfath...