Shadow grave / Marina Cohen.

Enhanced descriptions from Syndetics:

Tuck Everlasting meets The Village in Shadow Grave , a delightfully eerie middle grade novel by Marina Cohen about a boy trapped in a strange town where secrets turn deadly and the unnatural lurks in the night.

Twelve-year-old Arlo is afraid of fire, creepy TV shows, and even his own shadow--but most of all, he's afraid of losing his mother to the disease that nearly claimed her life a year ago.

During a Thanksgiving road trip, a sudden collision with a strange beast in the middle of the road totals the family's car, and Arlo, his mom, and his sister end up stranded in a small town.

There's something off about Livermore. No one has a phone or a car, and the townspeople aren't exactly friendly. Without phone service to make a call for help, the family stays at the Samuels' mansion, but inexplicable sightings at night set Arlo on edge. When he stumbles upon a dark secret that the town's inhabitants will kill to keep, getting out of Livermore becomes a matter of life or death.