She had married a younger brother of the family, who had left her a widow with one child.

This child was the only heir to Lord de Winter, if Lord de Winter did not marry.

All this showed d'Artagnan that there was a veil which concealed something; but he could not yet see under this veil.
In addition to this, after a half hour's conversation d'Artagnan was convinced that Milady was his compatriot; she spoke French with an elegance and a purity that left no doubt on that head.
D'Artagnan was profuse in gallant speeches and protestations of devotion.

To all the simple things which escaped our Gascon, Milady replied with a smile of kindness.

The hour came for him to retire.
D'Artagnan took leave of Milady, and left the saloon the happiest of men.
On the staircase he met the pretty SOUBRETTE, who brushed gently against him as she passed, and then, blushing to the eyes, asked his pardon for having touched him in a voice so sweet that the pardon was granted instantly.
D'Artagnan came again on the morrow, and was still better received than on the evening before.