The Potency of Ungovernable Impulses

By: Malka Older

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Hardcover | 28 October 2025

At a Glance

Hardcover
304 Pages

Dimensions(cm)
2.5 x 14.5 x 22.0

Hardcover

RRP $55.00

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A brand-new entry in the Hugo, Nebula, and Ignyte Award-nominated sapphic, cozy space-opera mystery series The Investigations of Mossa and Pleiti, which Charlie Jane Anders calls "an utter triumph."

When a former classmate begs Pleiti for help on behalf of her cousinâ"whoâs up for a prestigious academic position at a rival Jovian university but has been accused of plagiarism on the eve of her defenseâ"Pleiti agrees to investigate the matter.

Even if she has to do it without Mossa, her partner in more ways than one. Even if sheâs still reeling from Mossaâs sudden isolation and bewildering rejection.

Yet what appears to be a case of an attempted reputational smearing devolves into something decidedly more dangerousâ"and possibly deadly.

The Investigations of Mossa and Pleiti
The Mimicking of Known Successes
The Imposition of Unnecessary Obstacles
The Potency of Ungovernable Impulses

The Centenal Cycle
Infomocracy
Null States
State Tectonics

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