"If nothing comes of this conversation, should you hear that I had died suddenly in what appeared to be an accident would you be good enough to make sure I wasn't murdered?"

"Are you expecting to be murdered?"

"As a matter of fact I am. I've been expecting it for some time."

"And who is likely to murder you ?"

"That's just it. I haven't the remotest idea..."

...But a lot did come of this conversation which sets Biggles on the trail of an extraordinary series of murders involving the heirs of the Landville family and the curse under which they suffered. History and excitement combine to make this a thrilling detective story.

goodreads summary

Biggles is visited by Sir Leofric Landaville who has a surprising tale to tell. For generations his family has suffered from what could be called "the curse of the Landavilles". Intrigued, Biggles and Bertie travel to Ringlesby Hall in Hampshire to hear the story.