"Do you think, Doctor, that it is the blood of Dr. Cronin?"
"There is not the least doubt of it in my mind. It is almost certain that the doctor's body was in that trunk. If this is so, there can be little doubt that he met his death in the house on Ashland avenue."
After sending for Dr. Brandt and his colleague, the two police captains lost no time in putting the Carlsons on the rack. It was evident from the start that the family had known all about the condition of the interior of the cottage for days, if not weeks. They had hesitated about notifying the police, however, for fear that difficulty would be experienced in renting the cottage if the facts became known; while, at the same time, they were afraid to destroy and efface the evidences of the crime that they realized had been committed. Mrs. Carlson did not need any pressing to tell what she knew. From her story it was developed that on March 20th a tall, slender, pale-faced young man called at her house to learn the rent of the cottage. He was told he could have it for $12 monthly. The amount suited him, and he paid a month's rent in advance, without being requested to do so, and received the key. He went on to say that his name was Frank Williams, that he had two brothers and a sister, who would live with him, and that the sister would keep house. They were coming from Baltimore, and would join him in a day or two. He took the keys and went away, but the sister never came.
[Illustration: THREE OF THE CARLSON FAMILY.]
For a month there were no outward signs that the mysterious Frank Williams intended to occupy the building he had rented. Mrs. Carlson became very uneasy.