The Quavering Air by Simone Snaith

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All that divides Span from its dark sister world, Avid, are two extraordinary clocks set an hour apart. When a mysterious shapeshifter alters their settings, Avid’s beasts start slipping through rifts in the air, wreaking havoc on the many species of Span. Despite her insecurities and fresh heartbreak, the young human Renna answers a summons by the wise founders known as the Appon, to join a motley crew of champions chosen to save Span from destruction. On a journey riddled with attacks from otherworldly creatures, the team must put aside their prejudices and dark suspicions . . . because they dare not abandon the mission. From the author of Between The Water & The Woods comes a new adventure in a strange world full of magic and wonder, danger and humor, and unexpected romance.