Parallel Illusions

Sunny and Umbreon thought life couldn't get any more complicated. After losing their parents, the twins and their younger sister Astrid had grown used to handling things on their own-working ordinary jobs in a local mall and juggling the pressures of family, work, and grief. But everything changes the night Umbreon's experimental portal project accidentally sends Sunny, Umbreon, and half their house spiraling into another dimension.
Lost in a desolate, apocalyptic world ruled by a ruthless young man named Abaddon and his twisted crew, the brothers find themselves fighting to survive. With Sunny's creativity and Umbreon's sharp intellect, the duo hopes to escape. But dark forces threaten to unravel more than just their reality-there's more to this dimension than they first thought, and secrets lurk within its shadows.
Meanwhile, their friend Ace rushes to find out what happened to the brothers, teaming up with Astrid, who is just as determined to bring her siblings back. Together, they uncover a web of danger.
In a world where interdimensional portals collide with post-apocalyptic horrors, these teens will need every ounce of courage, intelligence, and each other to survive-and to prevent the collapse of everything they've ever known.

This was the first ACTUAL book I've ever written, so i'm aware it's bad.