The Door At The End Of The World by Caroline Carlson

Lucy Eberslee, a diligent gatekeeper at the end of the world, finds her routine disrupted when a mysterious stranger arrives, triggering a series of events that threaten the balance between worlds. As she embarks on an unexpected adventure across parallel realms, Lucy must navigate a web of secrets, alliances, and betrayals to prevent an impending catastrophe. With the help of unlikely allies, she discovers her own courage and the true power of friendship, all while unraveling the mysteries that lie beyond the door she once guarded.

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