Betty Vivian by L.T. Meade

If Betty Vivian really wished to keep her miserable secret, she had done wisely in removing the little packet from its shelter in the trunk of the old oak-tree; for of course Sibyl remembered it in the night, although Betty's wonderful story had carried her thoughts far away from such trivial matters for the time being. Nevertheless, when she awoke in the night, and thought of the fairies in the heather, and of the girl lying in the snow-bed, she thought also of Betty standing by the stump of a tree and removing something from within, looking at it, and putting it back again.

Sibyl, therefore, took the earliest opportunity of telling her special friends that there was a treasure hidden in the stump of the old tree. In short, she repeated Betty's exact action, doing so in the presence of Martha West.