Four best friends start a party-planning business in this fresh, funny tween novel from the authors of At Your Service and Breaking the Ice.Twelve-year-old Sadie loves helping her mom with her wedding planning business, and with Sadies mad organizational skills, shes a natural! Thats why its so devastating when her mother fires her after a Little Mermaidthemed wedding goes awry.Enter Sadies best friends: sporty Vi, ace student Lauren, and boy-crazy Becca. The girls decide that in order to get Sadies mom to reconsider, they have to make her see how amazing Sadie is at party planning. Except no ones gonna hire a twelve-year-old to plan a wedding. A birthday party, though? Definite possibility.Before long, RSVPyour one-stop shop for the most creative parties in townis born. Of course, Sadie cant wait to prove herself to her mom, but the other girls also have their reasons for enlisting: Vi has her eye on the perfect gift for her hardworking dad, and Beccas all aflush at the thought of connecting with Ryan, the new Irish cutie in town. And though Lauren thinks shes too busy with summer studies to officially join, shes willing to help out in any way she can.But in this particular party-planning business, nothing goes according to plan! Sadies mom is a perpetual no-show, Vis archrival is dead set on ruining her summer, Becca cant seem to get Ryan to glance in her direction, and Lauren keeps choosing studying over her friends. Is the girls friendship strong enough to survive a business? Or does RSVP spell the end of these BFFs?