Maya and Willy's favourite tree, the oak, is sick! They need to plant a truffle under it. But they discover that Polly the mole-cricket is eating everything under the tree! How are they going to save the oak.
A new little bee, Hannah, pretends she is not a real bee and that she can't find resin buds to make propolis. Maya wants to prove the contrary. Hannah ends up provoking a disaster making a big hole in the hive.
Maya is playing with little firebugs when she realises that they are alone so she tries to find their mother. She discovers the firebug mother is in despair: if she can't feed her brood, they run away to find a new mother.