4 books in series

Time Trips

Time Trips is a 4-book series with 4 primary works first released in 2014 with contributions by Jenny T. Colgan, Nick Harkaway, Trudi Canavan, and Jake Arnott.

Doctor Who: a Handful of Stardust
Doctor Who: Keeping Up with the Joneses
Doctor Who: Into the Nowhere
Doctor Who: Salt of the Earth