Siblings time travel to President Theodore Roosevelt's era and try to save a tree in this debut by a former White House speechwriter.Ever since their mother's inauguration as president three months ago, the Suarez sisters-third grader Clara and fifth grader Marissa-have chafed at the lack of freedom in White House life. When the girls find a secret passage in the State Dining Room, they follow it to a candlelit room containing old-fashioned furnishings and a 1903 newspaper with an article about a 2,000-year-old giant sequoia that will be cut down to make room for a dam to supply San Francisco with electricity. They also find a piece of parchment entitled "White House Clubhouse" with signatures of children who lived in the White House before them. By signing, they "promise to make a difference, because we can"-and when they emerge, they're back in the State Dining Room but during the presidency of Teddy Roosevelt. They meet first children Quentin and Ethel, and the four kids hatch a plan to stow away on the president's train that is heading to California. Their plan: to save the giant sequoia. This engrossing, well-rounded story combines adventure, daring, humor, history, and uplifting, kid-centric messaging as it explores the power of nature and the importance of protecting natural resources. The Suarezes are cued Latine in a predominantly white cast. Lee's crisp artwork adds to the humor and helps readers envision the historical setting.Hope abounds in this clever, empowering story. (author's note) (Adventure. 8-12)