These chapter books introduce beginning readers to the detective mystery genre. Perfect for the Common Core, kids can problem-solve with Nate, using logical thinking to solve mysteries! Nate the Great hates mushy stuff. But when he spies a big red paper heart taped to the outside of Sludge"s doghouse, Nate knows he must help out his favorite pooch. Wh has left Sludge a secret valentine? It"s a mystery until Nate finds out his friend Annie is missing a valentine. The case seems easy. Nate is relieved. No more mushy stuff. That"s what he thinks.