When science nut Suzy wakes in the night to find trolls laying train tracks through her hall, a comical romp begins, as The Train to Impossible Places (Usborne £12.99, 8+) by PG Bell, illustrated by Flavia Sorrentino, carries her through an encounter with a scary sorceress, wormholes and heavy responsibilities arising from her new Impossible Postal Express postman’s badge. Rollicking entertainment.