Micronauts - Steve Lyons

Angel's Gift is a small mid-western town known for its friendly neighbours, its world-class apple pie…and an interdimensional portal; a tear in the fabric of time and space.
Ryan Archer and his scientist father Dallas, have come to Angel's Gift to find an explanation to this phenomenon. At first, the investigation goes well, but then Ryan begins to notice odd little things, like recognising members of alien races that have travelled through the portal - aliens casually referred to a Micronauts. And then there are the mysterious disappearances.
Something is wrong in this town - Ryan knows it. Because the secret of Angel's Gift is connected to an enigmatic figure who has been haunting his dreams of late - a figure who has come to warn him of great danger.