Three Go Searching (Patricia St John)

Everyone knows a person like Waffi--mischievous, willful, and having a knack for getting others into trouble. David, whose father is a missionary doctor in Africa, is Waffi's friend. Although Waffi occasionally gets David into some difficult situations, David is learning to be a witness for God. When Waffi and David find a sick servant girl and a mysterious boat, an exciting adventure begins for them.