So Close to You Series by Rachel Carter

Lydia Bentley has heard stories about the Montauk Project all her life: stories about the strange things that took place at the abandoned military base near her home and people who've disappeared over the years. Stories about people like her own great-grandfather... moreLydia Bentley has heard stories about the Montauk Project all her life: stories about the strange things that took place at the abandoned military base near her home and people who've disappeared over the years. Stories about people like her own great-grandfather. When Lydia stumbles into a portal that transports her to a dangerous and strange new reality, she discovers that all the stories she's heard about the Montauk Project are true, and that she's in the middle of one of the most dangerous experiments in history. Alongside a darkly mysterious boy she is wary to trust, Lydia begins to unravel the secrets surrounding the Project. But the truths behind these secrets force her to questions all her choices - and if Lydia chooses wrong, she might not save her family but destroy them... and herself. less

These are the things of which Lydia is now certain: The Montauk Project has been experimenting with time travel for years. The Project's subjects are "recruits" from across time, recruits like Wes, Lydia's ally, friend, and love. The Project is now responsible for the disappearance of two members of her family... The conspiracy theorists were right about the Montauk Project all along. In this sequel to So Close to You, they're coming for Lydia next...