Cube of Trevalia (Trevalian Magic, Book 1‪)‬

Danny knows the metal Cube is magic. Of course, when you're only 13, people tend to doubt statements to that effect. The draw the Cube in Uncle Ethan's home has on Danny is irresistable, causing the boy to take matters into his own hands.
When the Cube's magic is activated, not only Danny, but his entire family are pulled into another world.
Trapped in a society they don't understand, running from a madman who covets the power of the Cube, they set out to discover the way back home, finding adventure, excitement, and danger along the way. The question is, can they even get back home, or will they need to adjust to new lives in this place?