The first book of a series that has some adventure and plenty of unicorns. Probably best for 8-12 year old girls. Note: My recommended ages for these books are flexible. Some children older and younger then the age list I have could enjoy any of these books.

A collection of stories. Some are spectacular. Others (one or two in particular come to mind) are kind of weird.

A lovely story. Good for 8-12 year old girls.

From the customer review I read, this isn't the last book in this series. I have mixed feelings about that. It would be great to have another book, but Mr. Coville takes so long to write his books, I don't know if I can stand the wait.

A very light, easy read and a beautiful storyline. I finished the entire series in one sitting. The covers and illustrations in all of these books are gorgeous. For younger audiences, maybe 4-8 year olds.

A book about a unicorn in the Fairy Realm series. I haven't read any of the others, but this one is good. The illustrations are amazing. Probably best for 4-8 year olds

And finally, for my (much) older readers, The Obsidian Trilogy. This is a good fantasy series that has a surprisingly large amount of unicorn characters for the age it's aimed at. Definitely check this trilogy out if the above list is too young for your tastes. I would say it's appropriate for mature 12 years olds, but not any younger. Best for teenagers.