There's still time! Find the perfect Father's Day gift with store pickup | Shop NowThere's still time! Find the perfect Father's Day gift with store pickup | Shop Now

Knock Knock

eBook
$4.99
Membership Card Icon
Collect stamps to save with Rewards. 10 stamps = $5. Learn More
Select a store to view item availability.

Available on compatible , the free NOOK App, and in My Digital Library

NOOK App

Download NOOK app

NOOK Devices

NOOK eReaders

  • NOOK GlowLight 4 Plus
  • NOOK GlowLight 4e
  • NOOK GlowLight 4
  • NOOK GlowLight Plus 7.8"
  • NOOK GlowLight 3
  • NOOK GlowLight Plus 6"

NOOK Tablets

  • NOOK 9" Lenovo Tablet
  • NOOK 10" HD Lenovo Tablet
  • NOOK Tablet 7" & 10.1"
  • NOOK by Samsung Galaxy Tab 7.0 [Tab A and Tab 4]
  • NOOK by Samsung [Tab 4 10.1, S2 & E]

Free NOOK Reading Apps

  • NOOK for iOS
  • NOOK for Android

BN.com website

Go to your Digital Library in My Account

Limit 1 per customer
Notes From Your Bookseller

The title of the book alone sets the mood at the start. A story is told. A knock is heard on a door. Inspector Ewert Grens arrives in the next chapter, and what he sees is not what was described. This book will set you on edge from the start. Be prepared for some serious breath holding.

The #1 international-bestselling thriller that tells the electrifying story of a police inspector and a former criminal informant in a race against time as they attempt to unravel past and present secrets.

He thought she was safe. Then the past came knocking.

Seventeen years ago, Criminal Inspector Ewert Grens was called to the scene of a brutal crime. A family had been murdered, and the only survivor--and witness--was the five-year-old daughter. The girl was placed in the witness protection ...