"Saw L. late yesterday evening. He will act today. Agrees with my suggestion about the Betty if necessary. J."
I thrust it into my pocket and opened the other.
"A copper come last nite and ask for you. He see Misses O."
For an instant I stared at this cryptic message in bewilderment; then suddenly the recollection of my final instructions to Gertie 'Uggins rushed into my mind.
So Sonia had gone to the police, or had at least contrived to send them a message which served the same purpose. Their visit to Edith Terrace was probably explained by the fact that she had given them both addresses so as better to establish the truth of her story. Anyhow the murder was out, and with a new and not unpleasant thrill of excitement I crushed up Gertie's wire in my hand and tore open McMurtrie's letter.
"DEAR MR. NICHOLSON,
"I have been away on business and have only just received your letter, otherwise I should have come to see you this afternoon. In the first place allow me to congratulate you most heartily on your success, of which personally I was never in any doubt.
"For the moment I have left the Hotel Russell, and am staying with some friends in Sheppey. I shall run up the river in their launch early tomorrow morning, as I believe there is a small creek close to the hut where we can put in.
"Please have a specimen of the powder ready, and if it is possible I should like you to arrange for an actual demonstration, as I shall have a friend with me who is already considerably interested in our little company, and would be prepared to put up further capital if convinced of the merits of your invention.
"You can expect us about high water, between half-past nine and ten.