EACH BOOK IN THIS EXCITING SERIES CONTAINS A THRILLING ADVENTURE STORY, PACKED WITH ENTERTAINING PUZZLES TO SOLVE. THERE ARE EXTRA CLUES TO HELP YOU IF YOU GET STUCK ALONG THE WAY AND ANSWERS AT THE BACK OF EACH BOOK. THE TIME TRAIN SEEMS TO BE AN ORDINARY TRAIN UNTIL BILL AND LUCY CLIMB ABOARD AND ARE WHISKED AWAY TO ANCIENT ROME. HERE THEY STUMBLE ON A POISONOUS PLOT AND FIND THEMSELVES CAUGHT UP IN A RISKY ROMAN ADVENTURE.