Miss Opal Denning lived in Terre Haute, the city on the highlands above the Wabash River in west-central Indiana.

https://en.wikipedia.org/wiki/Terre_Haute,_Indiana

It appears that Miss Denning has a job outside the home, as her mail is addressed in care of “Albrecht & Co.”

I found an on-line reference to a dry goods merchant named Albrecht in Terre Haute, but very little additional information about possible employers of Miss Denning.

In May of 1908, Opal received a romantic postcard from F. E. G.

The postcard was mailed from Creston, a city in south-central Iowa.

Creston was founded as a railroad camp of the Burlington & Missouri Railroad – and the city name reflects the location on the high point between the Missouri and Mississippi River basins.

https://en.wikipedia.org/wiki/Creston,_Iowa

The face of the postcard displays a couple sharing an intense moment – the young woman seems to be grasping the vest of the man whose arm encircles her shoulder.

The couple is well-dressed, the young woman in an elaborate dress and the man wearing a suit- and holding his hat and walking stick in the hand not engaged with his companion.

Above the pair, a verse describes the wild desire of a lover for the beloved.

“I care not for the stars that shine,

I do not hope to e’er be thine,

I only know I love you,

Love me, and the world is mine!

On the reverse, the message from F.E.G. sounds a note of annoyance.

The sender asks, “What is the matter over the river”.

The writer has “not heard from you”.

F.E.G has “been looking for a letter this long while”.

Nevertheless, the message concludes with a friendly, “Yours as ever”.

One hopes that Opal responded to her friend, that F.E.G. received a letter, and that the correspondents did not suffer the pangs of desperate and unsatisfied love.