The Midnight Gardener by R. G. Thomas

A lonely teenage boy whose father has moved them too often for him to make lasting friendships.
A mysterious neighbor his own age who hums as he gardens… at night… surrounded by fireflies.

Superstition is the town Thaddeus Cane and his father, Nathan, have settled in this time, and every evening Thaddeus becomes more intrigued with his new neighbor. When Thaddeus finally works up the nerve to visit his neighbor, the crush blooming underneath surfaces, and he realizes that Teofil, the midnight gardener, is lonely as well. When his father finds out where he’s been spending his time, Thaddeus is forbidden from returning. But the attraction is too strong, and soon Thaddeus is back in Teofil’s yard, leading to the revelation of long held secrets that upend Thaddeus’ quiet life and sends him on the adventure of a lifetime.