The Arcanum Sanctum - B T Sinclair - Bog

The Lost Library:
22 year-old Ophelia and her younger brother Thomas have never gotten an honest answer about the disappearance of their eldest sister six years ago. But when Thomas disappears in a similar way, Lia won't accept her parents lies anymore - taking matters into her own hands and changing the entire world as everyone knows it. The Hidden City:
When the youngest son of the corrupt king from the hidden city suddenly appears in Lia's world, she soon realizes that her quest is not going to be as straight-forward as she had hoped. With not only her brother Thomas' life in the balance but her entire world as well, Lia must gather her friends, her courage, and her newfound knowledge to keep the hidden city locked away, and her world safe once and for all. The Lifted Veil:
Lia and Thomas are haunted by forebodings of an unfamiliar and barren realm, a mystery that even the forest deity Axelia cannot resolve. Turning once more to the enchanted chamber for aid, Axelia summons three divine beings who might hold the key to deciphering Lia and Thomas' perplexing visions. But the help will come at a cost - and an agreement to the destiny of the library, the hidden city, and even the entirety of magic itself must be made - and soon.