The Mystery at Midnight by Lisa M. Hendey

If there's one thing Katie never thought she'd do, it was walk through something called the "Door of the Dead." During a class field trip to visit the monastery of the Poor Clares, Katie is unexpectedly swept up into her second Chime Travelers adventure. She finds herself in Assisi, the same city where her twin brother Patrick met St. Francis of Assisi on his last journey through time. Instead of meeting St. Francis, Katie meets a young woman named Clare. Clare has everything—she's beautiful, her family is wealthy, and she is to be married soon. Katie discovers that Clare also has a secret: she wants to leave everything behind and join Francis and his brothers in service to God. But Clare's family doesn't want her to go. On the night she leaves, Clare and Katie must run through the darkness and escape through a door only used for funerals, the Door of the Dead. Has Clare made a mistake? Is God really calling her to leave everything she knows behind? And should Katie go with her on this dangerous adventure? Book 4 in the Chime Travelers series, exciting new chapter books ideal for children in grades 2-4.