Write SQL query to solve given problem: What is the most expensive book item? Please provide a short description of projects related to those.. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT T1.item_name, T2.short_description FROM resources AS T1 INNER JOIN essays AS T2 ON T1.projectid = T2.projectid WHERE T1.project_resource_type = 'Books' ORDER BY T1.item_unit_price DESC LIMIT 1