Paula Hawkins’s debut psychological thriller The Girl on the Train was the top-selling title on the print and Kindle bestseller lists for the year to date. Film rights to the book, which went on sale in January, have already been optioned, and elsewhere on the print list other books with big-screen versions have had a strong showing so far in 2015. At #2 was Chris Kyle’s 2012 memoir American Sniper, which was adapted into the movie of the same name. John Green’s novel Paper Towns, published in 2008, hit at #5 on the list. The film version will open in theaters on July 24.

With less than two weeks of sales, E.L. James’s Grey, the newest installment in her Fifty Shades of Grey series, came in at #3 on the print list and #2 on Kindle. Donna Foley Mabry’s self-published Maude was the seventh bestselling Kindle book through July 1.

At this time last year, children’s and young adult books dominated the top of both the print and digital lists, but it was a different story in the first half of 2015. After Paper Towns, the next highest-ranking children’s title on the print list for the year thus far is Dr. Seuss’s perennial bestseller Oh the Places You’ll Go! at #7. Jeff Kinney’s The Long Haul, the ninth in his hugely popular middle-grade Wimpy Kid series, came in at #8. The book, released in November 2014, came in at #2 on the overall print bestseller list just months later, at year’s end.

BookScan Top 20 Print books, January 1–June 28, 2015

1 The Girl on the Train by Paula Hawkins (Riverhead)
2 American Sniper by Chris Kyle (Morrow)
3 Grey: Fifty Shades of Grey as Told by Christian by E.L James (Vintage)
4 All the Light We Cannot See by Anthony Doerr (Scribner)
5 Paper Towns by John Green (Penguin/Speak)
6 The Life-Changing Magic of Tidying Up by Marie Kondo (Ten Speed)
7 Oh, the Places You’ll Go! by Dr. Seuss (Random)
8 The Long Haul by Jeff Kinney (Amulet)
9 American Sniper (movie tie-in) by Chris Kyle (Harper)
10 Green Eggs and Ham by Dr. Seuss (Random)
11 Unbroken by Laura Hillenbrand (Random)
12 One Fish Two Fish Red Fish Blue Fish by Dr. Seuss (Random)
13 Strengths Finder 2.0 by Tom Rath (Gallup Press)
14 The Boys in the Boat by Daniel James Brown (Penguin)
15 Unbroken (movie tie-in) by Laura Hillenbrand (Random)
16 Jesus Calling by Sarah Young (Thomas Nelson)
17 The Wright Brothers by David McCullough (Simon & Schuster)
18 Legends and Lies by O’Reilly/Fisher (Holt)
19 Dead Wake by Erik Larson (Crown)
20 To Kill a Mockingbird by Harper Lee (Grand Central)

Amazon Top 20 Kindle e-books, January 1–July 1, 2015

1 The Girl on the Train by Paula Hawkins (Riverhead)
2 Grey: Fifty Shades of Grey as Told by Christian (Vintage)
3 All the Light We Cannot See by Anthony Doerr (Scribner)
4 American Sniper by Chris Kyle (William Morrow)
5 The Nightingale by Kristin Hannah (St. Martin’s)
6 Memory Man by David Baldacci (Grand Central)
7 Maude by Donna Foley Mabry (Donna Foley Mabry)
8 Big Little Lies by Liane Moriarty (Putnam)
9 Gone Girl by Gillian Flynn (Crown)
10 The Boys in the Boat by Daniel James Brown (Penguin)
11 Unbroken by Laura Hillenbrand (Random)
12 14th Deadly Sin by James Patterson and Maxine Paetro (Little, Brown)
13 Silent Scream by Angela Marsons (Bookouture)
14 Outlander by Diana Gabaldon (Dell)
15 The Stranger by Harlan Coben (Dutton)
16 The Longest Ride by Nicholas Sparks (Grand Central)
17 The Husband’s Secret by Liane Moriarty (Berkley)
18 Wild by Cheryl Strayed (Vintage)
19 The Martian by Andy Weir (Broadway)
20 The Liar by Nora Roberts (Putnam)