Jill Keppeler 
Dungeon Explorers [PDF ebook] 

Maria and Mike are prepared for another adventure in the world of Minecraft…at least they think they are! The sister and brother venture back into the special cave that contains a portal into the other world, ready to explore. But are they ready for more monsters, confusing mineshafts, and dungeons teeming with giant spiders? In this return to the characters’ Minecraft adventures, readers will get a bigger look at the excitement and dangers of this world and learn more about how teamwork and logical thinking can help.