Mr L’s The Sign of Four GCSE study guide includes explanatory notes on plot, characters, themes and the writer. 
 
In addition, there are notes on the Victorian Novella's form, structure, language, text and context, prerequisites for students to satisfy exam board’s Assessment Objectives in achieving levels 7,8 & 9. 
 
Also included in the GCSE revision guide are 20 essay practice questions, a list of key quotes, and advice on how to plan and write essays.