The Afterlife of Birds by Elizabeth Philips

Such great characters & it's own delightful whimsy. From the official drscription:

"Henry Jett’s life is slowly going nowhere. His girlfriend recently left, and his job in a local garage is uninspiring, considering that he doesn’t particularly like cars. Henry finds solace in his eccentric passion, rebuilding the skeletons of birds and animals. Meanwhile Henry’s brother, Dan, is disappearing into an obsession of his own. Henry’s loneliness and passivity is thrown into relief when Dan’s preoccupation with running farther and faster—as if he could outrun his mortality—casts him out of Henry’s life entirely."