The Book of Chaos (Starfell 1) by Jessica Renwick
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When a strange book lands in twelve-year-old Fable’s lap and her cousin disappears into its pages, she follows, hurtling into an enchanted forest far from the rolling hills of her home. This is a land filled with strange people, magical creatures, and more danger than Fable has ever dreamed of. She must battle for not only a way home, but for the lives of those she loves most. With the help of her peculiar new friends, Fable must learn to trust in herself or risk losing her cousin forever. Can she save him before it’s too late?