"When a human has a birthday, mice get to eat a big cake! When a mouse has a birthday, mice get to throw a big party! Ava and Dean can't wait to surprise Gregory on his birthday. They have the perfect gift: a special Abraham Lincoln suit made just for him! But making sure a mouse arrives at his surprise party on time is not easy...especially when human kids are on a Presidents' Day field trip at the White House!"--Back cover.