The Visitors

Ancient markers. A hidden portal. A rogue alien. On a hot August night, Jen Taverson is watching the Perseid meteor shower when a searing blast of light rips across the sky, warping the landscape. From the shadows of the nearby field, alien silhouettes flicker into existence. Jen tries to warn people in the nearby town, but no one will listen. Only Rob McCord, a former photojournalist, believes her.
His parents disappeared while looking for evidence of UFOs and he tells her their region has long been the site of unexplained phenomena. Working together they uncover disturbing markers suggesting an ancient portal is buried deep beneath the earth, dormant for millions of years. And they learn the arrival of the alien visitors is a frantic attempt to prevent one of their own species from reaching that portal and unleashing a catastrophic shift in time and space on Earth and beyond.
The clock is ticking. The endgame has begun. Unless Jen and Rob can get there first.