This is Sara Paretsky's most ambitious novel so far: interesting, exciting and well worth reading. (Literary Review
It is a daring departure for Paretsky, combining her interests in women's history, science and the Holocaust - and is a career-crowning triumph. (The Sunday Times
A literary comfort blanket with all the must-loved elements - Warshawski risking her neck for friends, cooing over cute dogs, exchanging sassy dialogue with her neighbour Mr Contreras and refusing to do housework - reassuringly present. And yet Paretsky never shies away from tough subjects: this latest case takes in everything from the Holocaust to abuses of power by Homeland Security. Paretsky is brave enough to write feel-good reads that often take you to places where you feel far from good. (Telegraph
Sara Paretsky is American's answer to P.D. James, with added violence. Her private eye, V.I. Warshawski, who comfortingly grows old alongside her readers, is so skilfully embedded in her landscape that I once drove through Chicago guided by a friend solely on her knowledge of the Warshawski oeuvre. CRITICAL MASS is a heady mixture of crack cocaine and nuclear physics, not to mention Nobel Prizes and internet hacking by the security services. (Michael Walsh, Book of the Year The Tablet
The sixteenth V.I. Warshawski thriller from one of America's greatest female crime writers, combining contemporary issues, the fight against injustice and fast-paced suspense.