When delivery drivers are abducted from their routes and found dead with cryptic letters, FBI Agent Riley Paige faces a predator who knows every neighborhood like the back of their hand. As delivery routes become death traps, can Riley stop him—or will she become the one to be delivered?

ONCE HIDDEN is book #25 in the bestselling Riley Paige mystery series, which begins with the #1 bestseller ONCE GONE (Book #1)—a free download with over 1,000 five star reviews!

A gripping and intense psychological suspense thriller featuring an astute yet anguished female protagonist, the RILEY PAIGE series is a compelling mystery filled with continuous action, edge-of-your-seat suspense, unexpected plot twists, and shocking discoveries. Its rapid-fire tempo ensures an addictive listen that's hard to put down, inviting listeners to immerse themselves well past bedtime. Fans of Lee Child, Robert Dugoni, and Rachel Caine are sure to fall in love.

Future books in this series are now available!

“An edge of your seat thriller in a new series that keeps you turning pages! ...So many twists, turns and red herrings… I can't wait to see what happens next.”—Reader review (Her Last Wish)

“A strong, complex story about two FBI agents trying to stop a serial killer. If you want an author to capture your attention and have you guessing, yet trying to put the pieces together, Pierce is your author!”—Reader review (Her Last Wish)

“A typical Blake Pierce twisting, turning, roller coaster ride suspense thriller. Will have you turning the pages to the last sentence of the last chapter!!!”—Reader review (City of Prey)

“Right from the start we have an unusual protagonist that I haven't seen done in this genre before. The action is nonstop… A very atmospheric novel that will keep you turning pages well into the wee hours.”—Reader review (City of Prey)