The Vacancy In Room 10 by Seraphina Nova Glass

The Paris Apartment meets The Wrong Family in this thrilling tale of crime, passion and murder set in a run-down apartment complex packed with shady characters willing to go to deadly lengths to keep their darkest secrets from the stranger in their midst.

When Anna Hartley’s husband, Henry, calls her with a terrible, guilty confession, she can’t believe what she hears. It has to be a bad joke—the mild, predictable artist she married would never hurt a fly, let alone commit murder. But her confusion turns to horror when police find his body washed up on the banks of the Rio Grande.
Desperate for answers to the millions of questions his untimely death has raised, Anna checks in to The Sycamores, the run-down motel turned apartment Henry rented as an art studio. As she absorbs every bit of gossip the eclectic mix of residents are willing to share about her husband and each other, she begins to piece together a picture of a very different man than the one she married, and the life he led behind her back. The more she learns, and the less sense things seem to make, she finds herself wondering: Did she ever really know Henry at all?
But Henry’s secrets aren’t the only ones; as Anna’s search for clues expands, Cass, the mysterious, jaded motel manager, seems more and more determined to keep Anna in the dark. And when threatening letters start appearing at her door, Anna has to decide what’s more important—the truth, or her own safety.