The Little School-Mothers by L.T. Meade

Almost immediately after early dinner, two waggonettes came up to the door, and the girls of the sixth form and the girls of the third form, with their governesses and Mrs Burton herself, started off for a long and happy day in some distant woods. They were to visit the ruins of Chudleigh Castle and go up to the top of Peter's Tower -- a celebrated place in the neighbourhood -- and afterwards they were to have tea on the grass; and, best of all, they need not return home until the moon came up.

The moonlight drive home would be the most fascinating part of the whole expedition. For days and days this picnic to Chudleigh Castle had been talked about; and Harriet, with the others, had enjoyed it in anticipation. Now, she had to stand by, gloomily holding Ralph's hand, while the carriages were packed with radiant, happy girls, and, what was still harder, she had to listen to their gay shouts, and, in particular, to their badinage at her expense.