Eco mystery trilogy

Nancy Drew discovers that conditions at the Casa Verde resort in Costa Rica are not as clean as they appear, and investigates to discover who is responsible for dumping the pollutants.

Nancy Drew and her friends, back in River Heights, continue to investigate the shady Green Solutions company.

Nancy Drew visits an eco-resort with her friends, but someone is determined to ruin their vacation.

Nancy Drew visits an eco-resort with her friends, but someone is determined to ruin their vacation.

Nancy Drew discovers that conditions at the Casa Verde resort in Costa Rica are not as clean as they appear, and investigates to discover who is responsible for dumping the pollutants.