I recognized the weapon in her hands.

"The police," she went on, "do not yet know that the letter of introduction you brought to the captain was signed by a man who addressed Fraser-Freer as Dear Cousin, but who is completely unknown to the family.

Once that information reaches Scotland Yard, your chance of escaping arrest is slim.
"They may not be able to fasten this crime upon you, but there will be complications most distasteful.

One's liberty is well worth keeping--and then, too, before the case ends, there will be wide publicity--" "'Well ?" said I.
"That is why you are going to suffer a lapse of memory in the matter of the hour at which you heard that struggle.

As you think it over, it is going to occur to you that it may have been six-thirty, not seven.
Otherwise--" "Go on." "Otherwise the letter of introduction you gave to the captain will be sent anonymously to Inspector Bray." "You have that letter!" I cried.
"Not I," she answered.