Redhead by the side of the road / Anne Tyler.

"Micah Mortimer is a creature of habit. A self-employed tech expert, superintendent of his Baltimore apartment building, cautious to a fault behind the steering wheel, he seems content leading a steady, circumscribed life. But one day his routines are blown apart when his woman friend (he refuses to call anyone in her late thirties a "girlfriend") tells him she's facing eviction, and a teenager shows up at Micah's door claiming to be his son. These surprises, and the ways they throw Micah's meticulously organized life off-kilter, risk changing him forever. An intimate look into the heart and mind of a man who finds those around him just out of reach, and a funny, joyful, deeply compassionate story about seeing the world through new eyes."-- Publisher.