Skylark Books
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Carole Hanson writes a letter to the daughter of a Middle Eastern President inviting her to come riding at Pine Hollow. She hopes she might get a reply with an interesting stamp, instead she gets security guards roaming the grounds looking for spies. When a real spy shows up, it's the Saddle Club who rides to the rescue.
The cheapest used copy of Horse spy is €1.49 at Label Emmaüs.
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