

Threshold
2 books
The Threshold series by Peter Clines has 2 books. Start with 14 (2012), then read the rest in the order below.
Threshold reading order

14
Peter Clines
Nate's new apartment in a historic Los Angeles brownstone seems like a fresh start, but beneath the surface of low rent and friendly neighbors lie unsettling mysteries. Strange occurrences, locked doors, and peculiar fixtures hint at secrets within the building's century-long history. As Nate befriends his neighbor Mandy and others, he discovers that each apartment holds its own unique enigma, weaving together a narrative that could threaten not only their lives but potentially everything.

The Fold
Peter Clines
Mike Erikson leads a quiet life, content with his ordinary existence despite possessing unique abilities. His peace is shattered when a former government contact draws him into a perplexing mystery involving a DARPA project aimed at achieving teleportation. However, the scientists involved are exhibiting disturbing changes, lives are being lost, and the very fabric of reality appears to be unraveling. Mike discovers the machine is far more than it seems, potentially unleashing something terrifying from beyond our known world.