When Gravelmuck Elementary's cleaning slimes escape and destroy the schoolyard with their acidic ooze, all claws and tails point to Mr. Snag, the school's caretaker, as the culprit. Determined to clear Mr. Snag's name, Tank and Fizz dive into the case, only to discover that the goop under Rockfall Mountain runs deep. The detective duo must outwit their eight-legged principal and survive an ancient war between high-tech janitors and spell-slinging...

For monster sleuths Tank and Fizz, proving fourth-grade bully Rizzo Rawlins is planning to cheat in the upcoming Battle Bot Cup should be a piece of cake. But cake crumbles fast, and the case soon leads the detectives to a mysterious hacker known only as the Codex, who threatens all of Rockfall Mountain with a very dark fate. With the help of their wizard-in-training partner, Aleetha, Tank and Fizz leap into action, dodging deadly battle bots and...

As the eve of the great Wizards' Summit approaches, wizards from all over Rockfall Mountain descend on the school at Shadow Tower to refine their craft. When professors start disappearing, it's up to magic-fearing monster sleuths Tank and Fizz to solve this spell-packed mystery and find the missing mages. Aleetha, their detective partner and a wizard-in-training, has dragged Tank and Fizz into the heart of the Shadow Tower, where libraries fly, spells...

When their school bus veers off course while taking the kids from Gravelmuck Elementary on a field trip, monster detectives Tank and Fizz witness a crime that brings them snout to snout with Rockfall Mountain's oldest monster, the ancient dragon Firebane Drakeclaw. Thieves have stolen the Crown of Peace, which keeps the monster clans of the Dark Depths from fighting, and Tank and Fizz saw the whole thing. Now the detectives must track down the thieves...

When valuable cargo ships vanish from Rockfall Mountain's busiest port, crime-fighting goblin detective Fizz Marlow and his troll sleuthing partner, Tank Wrenchlin, know Detective Hordish is going to need their help (whether he wants it or not). But it's Tank's mom, the harbor master who is really feeling the heat. It's her responsibility to keep the harbor safe, and the lost ships quickly cost her her job. Determined to help, Tank, Fizz and their...