Hidden Diary Books in Order

A canceled visit leaves Lucy dreading summer on the island, until a letter from 1932 leads her toward a hidden diary and adventure.

Lucy and Serena secretly shelter an injured stray dog despite household restrictions. When puppies complicate their rescue, they need a more lasting solution.

Lucy hesitates over an island birthday party, then a threatening response to an invitation forces her to choose whether to face her fears.

A diary challenge asks Lucy and Serena to confront their fears. An art fair and another public challenge put their courage to the test.

Camp divides Lucy from her island friends, leaving her torn between competing loyalties. Another camper's secret makes her choices even more difficult.

A tandem bicycle rally leaves Lucy wishing for a sibling to ride beside her. Her longing brings an unexpected question about family and belonging.

Lucy and Serena's latest challenge involves sharing good things in secret. But a chain letter promising luck makes Lucy question what she should pass along and what might happen if she refuses.

An advertising shoot could rescue the Double C Ranch from financial trouble. Lucy's forbidden ride on a stallion threatens the girls' plans to help.