Rainbow Bailey's best friend, Jill Jensen, needed help. Her son's ex-girlfriend, a senior student at the local college, wished to use Jill's backyard pool for a science experiment. For safety precautions, Jill insisted Rainbow and her older boys supervised Lydia when she was doing her experiments. Standing by as lifeguards as she tested a new type of scuba gear, Skylar and Hunter dove into the trial-and-error world of testing scientific theory.

The project was swimming along, until one morning, they discovered Lydia floating in the pool without them. Rainbow hoped it was an accident, but the boys insist it was murder, ultimately placing a target on their friend and their family.

Meanwhile Rainbow, who is used to rubbing people the wrong way, develops an enemy of her own. Every step turns out to be in the wrong direction. Or is it?

Will the Bailey family complete their research in time to free their friend and catch a killer before the competition ends and the suspects scatter across the county?

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