I do not think, monsieur, said Poirot pointedly, "that you quite realize how terrible it may be ”for you." And as Inglethorp did not appear to understand, he added: "Mr. Inglethorp, you are standing in very grave danger." The two detectives fidgeted. 
Poirot said something to Mr. Inglethorp and two detectives were fidgeting.
Poirot told Mr. Inglethorp that she was completely safe.