Max and Molly are needed in 1665 England to make sure nothing stops Sir Isaac Newton from coming up with his theory of gravity!  Newton discovered his theory of gravity by seeing an apple fall from a tree... But the Troublesome Trolls picked all the apples in the orchard!  Max and Molly must come...

After discovering their Spanish Teacher may be a friend of the Problem Solvers, Max and Molly are sent to 250 C.E. Mexico to help an Aztec community save their crop harvest. An angry rain God who has been making it rain for weeks!  Along the way, they learn about ancient Aztec & Mayan Gods,...

After a close call with Brad eavesdropping on them, Max & Molly head to 1684 Amsterdam in the Netherlands to stop the Troublesome Trolls from lowering the measurement of seawater and causing chaos in this canal-filled city.   While there, they come upon a secret hideout for Troublesome Trolls...