Christie Agatha. The Man in the Brown Suit

Collins English Readers, 2012. — 122 p. — ISBN:
9780007451555. — (Level 5).
The book is here: /file/1522293/
Pretty, young Anne Beddingfeld comes to London looking for adventure. But adventure finds her when she sees a man fall off an Underground platform and die on the rails.
The police think the death was an accident. But who was the man in the brown suit who examined the body before running away? Anne has only one clue, but she is determined to bring the mysterious killer to justice.
Anne’s adventure takes her on a cruise ship all the way to Cape Town and on into Africa…