Anthony Berkeley 
The Mystery at Lovers’ Cave [EPUB ebook] 

As the novel opens, the sparkling and witty Roger Sheringham has been asked by the Daily Courier to visit Hampshire to report on an apparent murder in the small seaside town of Ludmouth Bay. With him he takes his cousin Anthony Walton. 'Although there were more than ten years between the cousins (Roger was now thirty-six, Anthony a bare twenty-five), they had always been good friends, and that also in spite of the fact that they had scarcely a taste or a feeling in common.’ The two of them prove an effective and entertaining pair of investigators.