The Agency Series

Meet Mary Quinn: orphan, reformed thief, and the latest recruit to a top-secret women’s detective agency.

Victorian London just got a little grittier.

full of thrills and danger and wonderfully sharp writing
— BookPage

A Spy in the House

The Agency: Book One

Cover of YS Lee's novel, The Agency 1: A Spy in the House

*Winner, Canadian Children’s Book Centre inaugural John Spray Mystery Award

*Finalist, Agatha Award for Best Children’s/Young Adult Book

*Finalist, Ontario Library Association Red Maple Award

*An American Library Association Popular Paperback for Young Adults

*A Bank Street College Best Children’s Book of the Year

*An Arthur Ellis Award Best Juvenile Crime Book Nominee

Candlewick Press/Walker Books UK
ISBN-13 978-0763687489

Action-packed… twists and turns with each suspenseful chapter, and the interesting historical information only adds to the romantic, atmospheric setting
— Justine magazine

On sale in Canada at Chapters or Amazon

In the USA at Indiebound, Bookshop, Barnes & Noble, or Amazon

In the UK at the Book Depository

The Body at the Tower

The Agency: Book Two

Cover of YS Lee's novel, The Agency 2: The Body at the Tower

*Finalist, Canadian Children’s Book Centre inaugural John Spray Mystery Award

*Finalist, Australian Silver Inky Award

*An Arthur Ellis Award Best Juvenile Crime Book Nominee

Candlewick Press/Walker Books UK

ISBN-13 978-0763687502

I’m crazy about debut author Y. S. Lee’s Mary Quinn mysteries. They’re smart, spirited, romantic, and full of action.
— Cynthia Leitich Smith

On sale in Canada at Chapters or Amazon

In the USA at Indiebound, Bookshop, Barnes & Noble, or Amazon

In the UK at the Book Depository

The Traitor in the Tunnel

The Agency: Book Three

Cover of YS Lee's novel, The Agency 3: The Traitor in the Tunnel

*Finalist, Arthur Ellis Award for Best Juvenile/YA Crime Book

*An American Library Association Best Book for Young Adults

Candlewick Press/Walker Books

ISBN-13 978-0763687519

Definitely a detective to keep an eye on.
— School Library Journal

On sale in Canada at Chapters or Amazon

In the USA at Indiebound, Bookshop, Barnes & Noble, or Amazon

In the UK at the Book Depository

Rivals in the City

The Agency: Book Four

Cover of YS Lee's novel, The Agency 4: Rivals in the City

Candlewick Press/Walker Books UK

ISBN-13 ‎ 978-0763687496

pacing con brio and a perpetual sense of fun
— Sarah Weinman, B&N Review

On sale in Canada at Chapters or Amazon

In the USA at Indiebound, Bookshop, Barnes & Noble, or Amazon

In the UK at the Book Depository

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