Cover of Terra Incognita
Cover of Caveat Emptor
Cover of Semper Fidelis
Series

Medicus (Gaius Petreius Ruso)

3 books

Here are 3 books from the Medicus (Gaius Petreius Ruso) series by Ruth Downie, listed in series order where known and publication order otherwise.

Books in order

2
Cover of Terra Incognita

Terra Incognita

Ruth Downie

When Roman army doctor Gaius Petreius Ruso travels to the remote frontier of Britannia, he expects hardship—but not another suspicious death to investigate. As tensions rise among soldiers, settlers, and the local Britons, Ruso is drawn into a case where politics, prejudice, and personal loyalties prove as dangerous as any wound. Set against the vividly rendered world of the Roman Empire, this historical mystery combines atmospheric detail, dry humor, and a compelling investigation into power, identity, and justice.

MysteryDetective FictionAncient History
4
Cover of Caveat Emptor

Caveat Emptor

Ruth Downie

In this engaging Roman mystery, physician Gaius Petreius Ruso and his British-born wife, Tilla, find themselves drawn into a dangerous investigation amid the uneasy cultural tensions of the Empire. What begins as a troubling case soon exposes secrets involving ambition, commerce, and the precarious lives of those living far from Rome’s center of power. Combining sharp historical detail with dry wit, vivid characterization, and an absorbing whodunit, the novel explores marriage, loyalty, justice, and the clash between Roman and provincial worlds.

MysteryDetective Fiction
5
Cover of Semper Fidelis

Semper Fidelis

Ruth Downie

Returning to duty with Rome’s Twentieth Legion in Britain, army doctor Gaius Petreius Ruso is drawn into a disturbing series of unexplained injuries and deaths. As he investigates, the evidence leads him toward the celebrated Centurion Geminus—and toward the political currents surrounding the anticipated arrival of Emperor Hadrian. Set against the tensions of Roman-occupied Britain, this historical mystery combines sharp medical detection, military intrigue, and vivid period detail in a compelling story of loyalty, ambition, and hidden danger.

Historical FictionDetective FictionWar Fiction