Second paragraph of third chapter:

She’d been trekking for days across the grassy plains that lay beyond the valley and the river and the settlements, but at last the ground was beginning to climb. She was sure she would find answers here.

A rather lovely Fifteenth Doctor novel, with two different sets of cute aliens in potential conflict with each other, and the Doctor and Ruby sorting out the conflict. You won’t get the same level of characterisation here as in Ruby Red, but it’s a good sfnal concept, executed in a very Whovian way. You can get it here.