[3] The Seven of Hearts, by Maurice Leblanc. II; Arsène Lupin in Prison.
The Thibermenil case?[4] At the other end of the tableland, between Rouen and Dieppe.
[4] The Seven of Hearts. IX: Holmlock Shears Arrives Too Late.
The Gruchet, Montigny, Crasville burglaries? In the midst of the Caux country.
Where was Lupin going when he was attacked and bound hand and foot, in his compartment by Pierre Onfrey, the Auteuil murderer?[5] To Rouen.
[5] The Seven of Hearts. IV: The Mysterious Railway-passenger.
Where was Holmlock Shears, Lupin’s prisoner, put on board ship?[6] Near the Havre.
[6] Arsène Lupin versus Holmlock Shears, by Maurice Leblanc, Chapter V: Kidnapped.
And what was the scene of the whole of the present tragedy? Ambrumésy, on the road between the Havre and Dieppe.
Rouen, Dieppe, the Havre: always the Cauchois triangle.