That could be easily managed.

Shirley wouldn't bother them, father and mother were going to the Manse, Miss Oliver never played gooseberry, and Jims always slept the clock round from seven to seven.

She would entertain Ken on the veranda--it would be moonlight--she would wear her white georgette dress and do her hair up--yes, she would--at least in a low knot at the nape of her neck.
Mother couldn't object to that, surely.

Oh, how wonderful and romantic it would be! Would Ken say anything--he must mean to say something or why should he be so particular about seeing her alone?
What if it rained--Susan had been complaining about Mr.Hyde that morning! What if some officious Junior Red called to discuss Belgians and shirts?
Or, worst of all, what if Fred Arnold dropped in?
He did occasionally.
The evening came at last and was all that could be desired in an evening.

The doctor and his wife went to the Manse, Shirley and Miss Oliver went they alone knew where, Susan went to the store for household supplies, and Jims went to Dreamland.