It was the school summer holiday, August 2016. Kate Goldsmith, mother to 13-year-old Jake and 11-year-old Aimee, was in the bathroom at home in Harlington, Bedfordshire, getting ready for bed when she heard a car pull up outside. The children were on a camping holiday in Devon with their father, Mark, his partner Tracey and her two boys, Ethan, 13, Jake’s best friend since nursery school, and Josh, 11. Aimee had texted the night before to say they might be coming back early, but neither Aimee, J