Title: Mystery flowers
Description: From inner flap:

Diana Disston, a winsome, sweet-faced lass, has grown very close to her father since the death of her lovely mother whom they both adored. One morning, however, when Diana has been awaiting word that her father will be home from a business trip, the blow falls cruelly upon her. Couched in affectionate, yet strangely distant terms, comes a letter telling her that he is to be married again and to a distant cousin, only a few years older than herself, whom Diana has had reason to distrust even as a child. When the couple returns Diana can see only too clearly how subtly Helen has poisoned the mind of father against daughter.

But in the midst of her sorrow, she holds secretly against her heart the sweet mystery of some unknown person who, morning after morning in the time of her deepest trouble, has dropped for her a single, fragrant pink carnation in the same place on the dewy grass. How a reconciliation with her father is finally effected, how the "mystery flowers" are at last explained and how a new and more perfect happiness comes to Diana— these, under the sympathetic pen of Grace Livingston Hill, make a beautiful and moving story.