Librarian (Lenna's Arc Book 1) by Brian Fence

Lenna Faircloth thought she was content enough to be junior librarian at one of the grandest libraries on the Continent, so long as at the end of the day she can enjoy a glass (or two) of wine and some decent shut-eye. Reticent and unconcerned with trivial matters, Lenna is almost laughably nonplussed the day her childhood friend, Gilbert, appears at her door, asking her to help smuggle stolen goods across national borders. LIBRARIAN is the first part of a young woman's long journey set in an alternate, sparsely-populated world. When unfortunate circumstances leave a bizarre, out-of-place artifact of immense power in the sole custody of Lenna, she is forced to question her own wants, the source of her withdrawal from others, and the curious nature of the Continent's magic -- all the while being the target of numerous political factions longing to possess the strange item bound to her by a child's promise.