“Clever, biting, and page-turning, Woo’s PI series surely deserves future developments.”

—Terry Hong, BookDragon, in Shelf Awareness

“With its engaging heroine, this sci-fi meets cozy, with a large dose of luxury fantasy thrown in, is a delight.”

—Karen Muller, Booklist

“…the characters are so nicely built out and act in ways so consistent with their personalities you will play right into Woo’s capable hands.”

—Vicki Weisfeld, Crime Fiction Lover

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Book 2 of Lefty-nominated
Siobhan O’Brien Mysteries

Publication Date:
September 5, 2023

After solving her first case, private eye Siobhan O’Brien is hired by Phillip Ahn, an octogenarian billionaire with his own personal island in the Pacific Northwest.  Ahn, a genius in artificial intelligence, swears that Duke, his youngest child and only son, is an impostor.  Is Ahn crazy, or is Duke really someone else?  As Siobhan attempts to arrive at the truth, her biggest challenge will be dealing with Ahn’s family, who all live under the same gilded roof: his current wife, his two ex-wives, and their awful, privileged children.

What is the real reason that Siobhan was brought to this isolated estate?  If she can keep her head – literally and figuratively – she’ll learn that family secrets have some very Deep Roots.

Advance Praise

“Funny and deliciously entertaining, featuring a witty, smart Korean-American-adoptee private investigator, a mysterious billionaire family whose son may have been replaced by an impostor, and an uber-swanky AI-fueled mansion in a private island. I couldn’t turn the pages fast enough!”

—Angie Kim, Edgar-winning and internationally bestselling author of Miracle Creek and Happiness Falls

“Woo’s absorbing tale, told with trademark wit and incisive modern commentary, unravels a family’s twisted, layered secrets.”

 —Jennifer J. Chow, Agatha, Anthony, and Lefty nominated author of Death by Bubble Tea

“From its engaging P.I. protagonist to its setting in a billionaire’s mysterious hi-tech manse that pushes artificial intelligence to a whole new level, Deep Roots takes readers on a fabulously wild ride.”

 —Ellen Byron, USA Today bestselling author

“Deep Roots explores complex dynamics among identities, cultures, and technologies in an absorbing mystery with surprises at every turn.”

—Cynthia Kuhn, author of the award-winning Lila Maclean Academic Mysteries and Starlit Bookshop Mysteries