Rachel
Rachel asked Ruth Downie:

Someone gave me a copy of Terra Incognita. I wonder if I should read book #1 Medicus, first?

Ruth Downie Hi Rachel,
This is always the problem with a series, isn't it? I hope all the books make some sense as stand-alones, but I'm probably a bit too close to tell.
So I've quoted a review of "Terra Incognita" below that might help you decide.
Hope you enjoy the read, whichever way you choose to do it!
Best wishes,
Ruth
“If you missed Downie's debut novel, Medicus, which introduced regimental doctor Gaius Petreius Ruso and his slave/housekeeper Tilla, you'll want to get caught up. This book, which is even better than the first, opens with the pair headed to northern outposts, where Ruso hopes to gain some advancement...This is a terrific series that historical mystery fans shouldn't miss - Downie's knowledge of Roman military medicine is phenomenal - but you do need the background of the first book.” ―Margaret Cannon, Globe and Mail

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