Can’t get enough of Paula Hawkins' The Girl on the Train? Dive a little deeper into her world, discover hidden treasures, and hang out with the characters just a little longer with this Sidekick.

Warning: This is an independent companion to The Girl on the Train, meant to enhance your experience of the novel. If you have not yet bought Paula Hawkins' novel, make sure to purchase it before buying this unofficial Sidekick.

Riding the train on her daily commute, Rachel watches the picture-perfect couple she’s dubbed "Jess and Jason" as they go about their lives. But one day she sees something that changes her perception of the couple forever—and leads her deep into the darker truths that lie beneath the pretty smiles and charming houses of Blenheim Road.

First published in the U.K. in 2012, The Girl on the Train is Paula Hawkins' debut novel. The New York Times has said it "has more fun with unreliable narration than any chiller since Gone Girl."

With this Sidekick, you’ll:

• Learn what you might have missed on your first read of Hawkins' novel

• Uncover some of the book’s hidden gems and underlying themes

• Explore a possible alternate ending and imagine ideas for a sequel

• Spend some more time with the characters you've come to know and love (or hate), delving deeper into their psyches and hidden motives.

• Get a chance to discuss The Girl on the Train with other savvy readers

Sidekicks are entertaining and insightful reading companions, filled with delightful commentary and thought-provoking questions. What are readers saying about Anna Call's Sidekicks? "Makes the book much more interesting," "a real eye-opener," a "beautifully written perspective into what is actually happening between the lines." Designed to be read side by side with the novels they complement, they’ll give you even more reasons to love some of today’s best books.