AustLit

High in the Transylvanian woods, at the castle Piscul Draculi, live five daughters and their doting father. It's an idyllic life for Jena, the second eldest, who spends her time exploring the mysterious forest with her constant companion, a most unusual frog. But best by far is the castle's hidden portal, known only to the sisters. Every Full Moon, they alone can pass through it into the enchanted world of the Other Kingdom. There they dance through the night with the fey creatures of this magical realm.

The sisters' peace is shattered when their father falls ill and must go to the southern parts to recover. Although their cousin Cezar arrives to help the girls survive the brutal winter, Jena, the second eldes of the girls, suspects he has darker motives in store. Meanwhile, one of her sisters has fallen in love with a dangerous creature of the Other Kingdom. It's an impossible union it's up to Jena to stop.

When Cezar's grip of power begins to tighten it puts everything that Jena loves - her home, her family, and the Other Kingdom she has come to cherish - in jeopardy. To save her world, Jena will be tested in ways she can't imagine–tests of trust, strength, and true love.'

[Source: www.goodreads.com]