Dr Alvah's new partner, Carter Greene, learns about a shipwreck, and the girls try to host an annual Explorers' Day play, but their plans go wrong.
The girls are put to the test when a mysterious blackout causes chaos across the entire city, and distracts everyone from Carter Greene's evil plan.
Mia discovers an old map and sets out on an adventure to locate treasure it leads to. Meanwhile, Carter Greene orders Ricky and Joey to find the map.
The girls set out to investigate when the Heartness Monster returns, and Lake Heart's swimmers are too afraid to enter the water.
The girls encourage everyone in town to grow plants in Carter's donated community garden, but soon learn the truth about where the garden's water is coming from.
An Explorer's painting is stolen from the art museum, and Emma puts her skills to the test as she tries to create a decoy.
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