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Collins introduces Agatha Christie, the Queen of Crime, to English language learners through adapted versions of her renowned detective novels. As the most widely published author globally, Christie’s works have been tailored for intermediate learners using the Collins COBUILD grading scheme. This adaptation is part of the Collins ELT Readers series, specifically Level 4, which aligns with CEF level B2 and features a word count of 20,000 - 26,000 words. Each book includes a free online reading of the adapted version, character notes, cultural and historical context, a glossary of challenging words, and additional online resources for students and teachers at www.collinselt.com/readers. In the gripping plot, renowned scientists are mysteriously vanishing, and the only person who can reveal the truth is on the brink of death following a plane crash. As the search for the missing scientists intensifies, Hilary Craven, in a Casablanca hotel room, contemplates suicide. Her attempt is thwarted by a man who presents her with an unexpected and thrilling alternative. Collins ELT Readers are categorized into four levels: Level 1 (A2), Level 2 (A2-B1), Level 3 (B1), and Level 4 (B2), all carefully graded to enhance the enjoyment and educational value of the reading experience.