For many retailers, Mother's Day is the third biggest book-buying holiday, after Christmas and Father's Day. Choice picks include new novels from Mary Higgins Clark, Anita Shreve and Alexander McCall Smith. In nonfiction, there's Walter Isaacson on Einstein, Richard Preston on The Wild Trees and, for self-serving gift-givers, Giada De Laurentiis's Everyday Pasta. In kids' books, Mo Willems enters the early reader market and Patrick Carman debuts a new series.

| April 1 |*Disney AdventureStories (Disney Press, $15.99). 200,000 copies.*My Friend Is Sad! and Today I Will Fly! (An Elephant and Piggie Book) by Mo Willems (Hyperion, $8.99 each). 150,000 copies each.*Disney Fairies: Flower Fashions by Lara Bergen (Disney Press, $14.99). 100,000 copies.*Disney's The Lion King and The Little Mermaid Storybook and CD (Disney Press, $12.99 each). 100,000 copies each.*The Gulps by Rosemary Wells, illus. by Marc Brown (Little, Brown, $16.99). 100,000 copies.*The Magician Trilogy Book Three: The Chestnut Soldier by Jenny Nimmo (Orchard, $9.99). 100,000 copies.*Titanic: The Ship of Dreams (Scholastic, $18.99). 100,000 copies.| April 3 |
I've Heard That Song Before by Mary Higgins Clark (Simon & Schuster, $25.95). 1 million copies.
Everyday Pasta by Giada De Laurentiis (Clarkson Potter, $32.50). 600,000 copies.
Paula Deen: It Ain't All About the Cookin' by Paula Deen (Simon & Schuster, $32). 300,000 copies.
*Ghost Ship by Mary Higgins Clark, illus. by Wendell Minor (S&S/ Wiseman, $17.99). 400,000 copies.
*Pirates: Most Wanted by John Matthews (Atheneum, $16.99). 250,000 copies.
The 3-Hour DietCookbook by Jorge Cruise (Collins, $24.95). 150,000 copies.
*Atherton: The House of Power by Patrick Carman (Little, Brown, $16.99). 150,000 copies.
Better: A Surgeon's Notes on Performance by Atul Gawande (Metropolitan, $24). 150,000 copies.
Inside Power by Gary Sheffield and David Ritz (Crown, $24). 125,000 copies.
[*, *] Skulduggery Pleasant by Derek Landy (HarperCollins, $17.99). 125,000 copies.
Hatched! The Big Push from Pregnancy to Motherhood by Sloane Tanen (Bloomsbury, $14.95). 75,000 copies.
Angelica by Arthur Phillips (Random, $25.95).
| April 5 |
*The Misadventures of Benjamin Bartholomew Piff #1: You Wish by Jason Lethcoe (Grosset & Dunlap, $9.99). 100,000 copies.
Mergers & Acquisitions by Dana Vachon (Riverhead, $23.95).
| April 9 |
Chasing Life: NewDiscoveries in the Search for Immortality to Help You Age Less Today by Sanjay Gupta, M.D. (Warner, $24.99). 125,000 copies.
| April 10 |
Einstein: His Life and Universe by Walter Isaacson (Simon & Schuster, $32). 500,000 copies.
*Mars Needs Moms! by Berkeley Breathed (Philomel, $16.99). 300,000 copies.
*The Amazing Spider-Man Pop-Up, edited by Caroline Repchuk, design and paper engineering by Andy Mansfield (Candlewick, $24.99). 150,000 copies.
*The Wizardology Handbook: A Course for Apprentices by Dugald A. Steer, illus. by Anne Yvonne Gilbert et al. (Candlewick, $12.99). 150,000 copies.
From the Heart: Seven Rules to Live By by Robin Roberts (Hyperion, $19.95). 110,000 copies.
Fresh Disasters by Stuart Woods (Putnam, $25.95). 100,000+ copies.
Obsession by Karen Robards (Putnam, $24.95). 100,000+ copies.
*We Shall Not Sleep by Anne Perry (Ballantine, $21.95).
*Sleeping with Strangers by Eric Jerome Dickey (Dutton, $24.95).
The Wild Trees by Richard Preston (Random, $25.95).
| April 13 |
The Little Book ofCommon Sense Investing: The Only Way to Guarantee Your Fair Share of Stock Market Returns by John C. Bogle (Wiley, $19.95). 150,000 copies.
| April 17 |
The Children of Húrinby J.R.R. Tolkien, edited by Christopher Tolkien (Houghton Mifflin, $26). 250,000 copies.
The Duke Diet: The World-Renowned Program for Healthy and Lasting Weight Loss by Howard J. Eisenson, M.D., and Martin Binks, Ph.D. (Ballantine, $25.95). 150,000 copies.
Laced by Carol Higgins Clark (Scribner, $24). 120,000 copies.
Chasers by Lorenzo Carcaterra (Ballantine, $25.95).
The Woods by Harlan Coben (Dutton, $26.95).
*The Good Husband of Zebra Drive by Alexander McCall Smith (Pantheon, $21.95).
| April 24 |
Body Surfing by Anita Shreve (Little, Brown, $25.99). 400,000 copies.
*Pirateology Guidebook and Model Set by Capt. William Lubber, edited by Dugald A. Steer (Candlewick, $17.99). 250,000 copies.
Nixon and Kissinger: Partners in Power by Robert Dallek (HarperCollins, $32.50). 200,000 copies.
*Horseradish: Bitter Truths You Can't Avoidby Lemony Snicket (HarperCollins, $12.99). 150,000 copies.
*Warriors: Power of Three #1: The Sight by Erin Hunter (HarperCollins, $16.99). 150,000 copies.
Back on Blossom Street by Debbie Macomber (Mira, $21.95). 100,000+ copies.
The River Knowsby Jayne Ann Krentz writing as Amanda Quick (Putnam, $24.95). 100,000+ copies.
*Evil Genius by Catherine Jinks (Harcourt, $17). 100,000 copies.
*The Giving Tree Gift Edition by Shel Silverstein (HarperCollins, $16.99). 100,000 copies.
The Ministry of Special Cases by Nathan Englander (Knopf, $25). 100,000 copies.
*Edenville Owls by Robert B. Parker (Philomel, $17.99). 100,000 copies.
DO YOU! 12 Laws to Access the Power in You to Achieve Happiness and Successby Russell Simmons with Chris Morrow (Gotham, $25).
| April 27 |
Inside the Mind of BTK: Portrait of a Serial Killer by John E. Douglas (Jossey-Bass, $24.95). 125,000 copies.

—with reporting by Raya Kuzyk and Joy Bean

* = PW starred review

* = Children's titles