Hair, Hair, Everywhere

Someone's been digging up Mrs. Ruston's tomatoes. She thinks it's Noelle's dog, Rover, and unless Noelle can find the real thief, Rover's in big trouble.

It's the hairiest case yet for Mr. Merlin's Third-Grade Detectives. Hair in Mrs. Ruston's tomato patch, hair in Amber Lee's hamburger -- can Noelle and Todd comb through the evidence and solve the mystery?

WHO SENT AMBER LEE AN ANONYMOUS LETTER?

Everyone loves the new teacher, Mr. Merlin. Mr. Merlin used to be a spy, and he knows all about secret codes and the strange and gross ways the police solve mysteries.

Now there's a mystery in their very own class -- someone sent Amber Lee Johnson an anonymous letter. Noelle and Todd want to solve the mystery before anyone else. But first they have to figure out Mr. Merlin's clues. How can a bunch of envelopes tell them who sent the letter?

The Third-Grade Detectives are looking forward to their field trip to a local art museum, where a priceless fifteenth-century statue of Joan of Arc is on loan from a Paris museum. But when they arrive, they discover that the statue has been stolen
The police quickly find the statue -- smashed into pieces and thrown in a Dumpster. Why would someone steal the statue only to destroy it? It looks like a new case for the Third-Grade Detectives -- even if the museum director doesn't seem to want their help.

The tree house is back--but where is the enchantress Morgan le Fay? The
search for her begins as Jack and Annie are transported back to ancient Japan,
where they find themselves in the cave of a ninja master. Will the evil
samurai warriors get to Jack and Annie before they can learn the secrets of the
ninjas?

Jack and Annie are whisked off to the vast plains of Africa, where they must
solve Morgan le Fay's third magical riddle. But that's only the beginning! Once
the riddle is solved, they still have to get past a pride of lions, a humongous
herd of rampaging wildebeests, and one very hungry Masai warrior.

Eight-year-old Jack and his younger sister Annie find a magic tree house, which whisks them back to an ancient time zone where they see live dinosaurs.