HELP! Tooth Fairy is in Trouble — Effin Older

Tulip has lost her first tooth. Should she put her tooth under her pillow for the Tooth Fairy? While she's deciding, she gets a visit from Poppy, a fairy in the Tooth Fairy's court. Poppy tells her that Queen Quinella, the Tooth Fairy, is in a heap of trouble. Tulip and Washington Twinkle, along with their basset hound, Truffle, fly to Shimmer-Shire, the Queen's beautiful fairy queendom. They need to find out who's trying to ruin the Tooth Fairy's plans for Shimmer-Shire Sunday — a super special day for children all over the world. Will the Twinkles get there in time to find the scoundrel? Will they save the fairies' extra-special day?