"Well, she can't be guilty. Who else?"
Bocaros reluctantly admitted that Mrs. Baldwin sometimes came.
On hearing this, Tracey looked disturbed. "Can she have taken the key?"
"Nonsense!" said Arnold decisively--"a fat, lazy woman like that? Besides, the person who had the key would write the letters, seeing that the key came in one. Why should Mrs. Baldwin desire to get me and Laura into trouble?"
"I don't know," murmured Tracey anxiously, and recalling Mrs. Baldwin's behaviour at the Hampstead cottage. "She's a queer fish. Then that locket with her picture----"
"I have seen Mrs. Baldwin with such a locket," said Bocaros.
"Oh, you have." Tracey, much alarmed, looked at Calvert. "I say, you don't think she killed Mrs. Brand?"
Grave as the situation was, Calvert smiled at the idea of Mrs. Baldwin in the character of Lady Macbeth. "I would as soon think of my having done it myself," he declared. "There is some mystery about all this. Can you solve it, professor?"
"No," said Bocaros. "I have told you all. What will you do?"
"Interview Mrs. Baldwin, and ask her about the locket," said Arnold, rising. "By the way, I must see Jasher. He may have made some discovery."