August W. Derleth & Karl Wurf 
The Statement of Justin Parker [EPUB ebook] 

In this chilling tale, Justin Parker recounts the mysterious disappearance of his lifelong friend, Michael Salisbury. Recently returned from Africa, Michael confides in Justin about a stolen diamond and a relentless pursuer. As strange events unfold at Michael’s home on the desolate Salisbury Plain, Justin begins to fear for his friend’s safety. When Michael vanishes without a trace, Justin sets out to uncover the truth behind the sinister forces at play.