Almost all the stories lack the element of surprise, the twist of tale that marks a good short story (without having to be O Henrysque; okay I just made that word). To be fair to the author stories like "Secret Keeper's Secret" do intrigue the reader for quite some time but their number is miniscule and the consistency is lacking.
There is inconsistency (though it does not matter much) in the length of stories. From six pages long to two page long, they do not hold the attention of the reader well. And then there are some stories like the last one in the book (Langu's Calling) which begin well but do not reach the pinnacle and become dampeners.
Perhaps the book is targeted at kids who can derive some moral lessons (there are quite a few of them) and hold on to very short stories well. The book does not work for adults.