Solitaire Mystery

Twelve-year-old Hans Thomas lives alone with his father, a man who likes to give his son lessons about life and has a penchant for philosophy. Hans Thomas'' mother left when he was four (to ''find'' herself) and the story begins when father and son set off on a trip to Greece, where she now lives, to try to persuade her to come home. En route, in Switzerland, Hans Thomas is given a magnifying glas...