The Spy Who Caught a Cold by Philippa Lowthorpe

6.40

Ten-year-old Clossie is having the worst holiday of her life – dragged to a seaside naturist resort by her fun-loving single mother. When Mum starts flirting with a fishmonger called Nick, there’s nothing for it but her to tail them with binoculars to try and unravel the adult mysteries of attraction.