The SOS Brigade is going on a summer retreat. And what better way to enjoy a summer retreat than on a deserted island? But if the mysterious island mansion doesn’t live up to Haruhi’s expectation, will she cause another incident? Or something worse?

Haruhi gets her wish for a murder mystery when the master of the house is found dead! But an actual murder may be more than she can handle. As they work to solve the case, things become more and more dangerous. Can they figure it out?