An introverted bookworm returns to her country hometown to find that her younger brother is dating the girl who made her life hell in high school and they must work together to survive a zombie apocalypse.

That sounds really interesting :)

Agreed with DPG.

The finding a safe haven from the Zombies is the A plot, all the other interpersonal stuff is the B and C plots - but loglines are about describing the A plot.

The biggest dramatic problem, the driving conflict of the plot, is a zombie apocalypse; yet it's not mentioned until literally at the end of the logline. ?If it's that important, it should lead off the logline, not end it.

?