Mel Foster and the Time Machine — Julia Golding

How do you catch an international treasure thief who can travel in time? That's the fiendish challenge that faces Mel Foster, Eve Frankenstein, and their friends when priceless items begin vanishing all over the world. The Mona Lisa, Queen Victoria's Crown Jewels -- nothing is safe! But the next item on the thief's list is no diamond. It's Mel himself. Before Mel knows it he's been kidnapped and stranded in the past. He's back in time, and back in trouble! The time-twisting follow up to Mel Foster and the Demon Butler, winner of a Primary Teacher Bronze Award 2015.