Vortex

Julie Cross's Vortex is the thrilling second installment of the Tempest series, in which the world hangs in the balance as a lovelorn Jackson must choose who to save
Jackson Meyer has thrown himself into his role as an agent for Tempest, the shadowy division of the CIA that handles all time-travel-related threats. Despite his heartbreak at losing the love of his life, Jackson has proved himself to be an excellent agent. However, after an accidental run in with Holly—the girl he altered history to save—Jackson is once again reminded of what he's lost. And when Eyewall, an opposing division of the CIA, emerges, Jackson and his fellow agents not only find themselves under attack, but Jackson begins to discover that the world around him has changed and someone knows about his erased relationship with Holly, putting both their lives at risk all over again.