What is the author's style in The Boy Who Harnessed the Wind: Creating Currents of Electricity and Hope by William Kamkwamba?

The book's format is essentially linear and straightforward, narrating events as they occur and discussing the effects of those events on the lives and actions of William, his family and his friends. The exception is the prologue which takes, as prologues often do, an important incident from the main body of the narrative line (in this case, the first public test of the windmill in Chapter 11) and portrays it before establishing any significant narrative context with the aim of triggering and/or engaging the reader's interest right from the beginning.