This was the only satisfactory explanation of her presence there; whether she came that night for the first time, or as a supplement to other similar visits, it was unquestionably Coolidge whom she sought.
For what purpose?
To West's mind only one object appeared probable.

The man was too far advanced in life--certainly much above sixty from his appearance--to be involved in a love affair with so young and attractive a woman.

Moreover in such a case she would scarcely seek him out here in this private home, where he was merely a transient guest; he would never venture to use a place like this as a rendezvous.

That was unthinkable.
Some other purpose, demanding immediate attention, must furnish the reason for her venturing to enter this house at such an hour, and coming directly to the room where she supposed Coolidge to be sleeping.

To West's mind there could be but one answer.