Malcolm MacPhail has lived, for all of his twenty or so years, in a fishing village on the north coast of Scotland. He lives with his grandfather and, though he has never met his parents, has no curiosity about the details of his birth. However, others in the town have their own curiosity, and their own suspicions, about where this highland man and his infant grandson came from, those twenty or so years ago. When the local marquis and his daughter come to live in their grand estate just outside the town, unoccupied for many years, events begin to move which introduce to them the humble Malcolm, and which may shed some light on Malcolm's past while changing the course of his future.

An extremely wealthy but reclusive man has died, leaving an eccentric will which hints at great riches hidden somewhere in the house. Most of the people at the reading of the will did not know the deceased in person, but had received kindnesses from him, for instance by the payment of school and university fees. The principal beneficiary, a great-nephew, also did not know him. The only two people who really knew him were the old lawyer who dealt with his affairs, and an old Indian servant. Yet when the will had been read, and they all went to where the treasure–gold, jewels and bank-notes–were supposed to be hidden, nothing could be found.

Joe Carstairs is a boy on a farm in Australia. His father is a keen naturalist who, some years before had set off for New Guinea in search of specimens, and never been heard of again. Joe is old enough to mount a search expedition, and takes with him a local doctor and an aboriginal worker on his farm. They find themselves joined by a stowaway, Jimmy, whose father is a squatter (farmer) nearby, together with his dog, Gyp.This team sets off, arrive in New Guinea, hire some more porters, and travel guided by some sixth sense straight to where Mr...

In California settlers are trying to make a living working as fruit-growers. Problems with blights and insects mean that the crops are failing. A prospector arrives and tells stories of ancient cities where there is a lot of gold. He then dies. Some of the settlers decide to go and search for the gold. They have long distances to travel and meet many challenges along the way. They eventually reach one of these cities and find evidence that it has been abandoned by invaders hundreds or thousands of years ago...