The Elsewhere Chronicles Vol. 1 The Shadow Door (comics)

In this graphic novel trilogy, middle schoolers Max, Theo, and Noah team up with Rebecca the day her Grandpa Gabe is buried. They decide to explore his house, rumored to be haunted. Their visit is cut short when they are frightened by a noise in the dark and worried parents summon them home. The next day, they return only to discover a movie projector, one of Grandpa Gabe's many inventions, that leads them into a whole other world through the light from the lens. Suddenly they find themselves on a journey in this other world with a cast of characters trying to battle the Shadow Spies who abhor the light.