Local book lovers can join thousands of readers around the world in reading a historical fiction thriller eBook during Big Library Read, the world’s largest digital book club.

Through Aug. 17, patrons of the North Olympic Library System (NOLS) can borrow and read copies of this year’s selection, Tim Mason’s “The Darwin Affair,” with no waiting.

NOLS readers can solve the mystery from home — with a valid library card — by visiting anytime.overdrive.com or downloading the Libby app, then discuss online at discuss.big libraryread.com.

A historical fiction novel, “The Darwin Affair” takes place in London during June 1860. When an assassination attempt is made on Queen Victoria and a petty thief is murdered moments later, Detective Inspector Charles Field surmises the crimes are connected to an even more sinister plot. Field’s investigation exposes a conspiracy in which the publication of Charles Darwin’s controversial “On the Origin of Species” sets off a string of murders, arson, kidnapping and the pursuit of a madman named the Chorister.

As he edges closer to the Chorister, Field uncovers dark secrets that were meant to remain forever hidden.

Facilitated by Rakuten OverDrive, Big Library Read is an international reading program that simultaneously connects millions of readers around the world with an eBook through public libraries.

The free program only requires a NOLS library card to get started. Apply for a library card at www.nols.org/library-card.

To join the discussion, learn about past Big Library Read titles and download Libby, visit biglibraryread.com.