Books in Three Cousins Detective Club series

When a vandal sabotages restoration work at a run-down lighthouse, the cousins set out to find the culprit.

The three cousins are stuck babysitting their bratty third cousin Patience and when she disappears while they are visiting an old mansion, they must investigate

Ten-year-old cousins Titus, Timothy, and Sarah-Jane go on vacation and set out to discover why the dolphins they are visiting don't seem to want to eat

Hoping to convince his parents that he is responsible enough to have a pet, Titus McKay volunteers to dog-sit his neighbor's crabby terrier, and when the dog suddenly turns sweet and lovable, the cousins determine that it has been switched. Original. IP.

When Sarah-Jane discovers that several other people want the same old favorite books which she has just found at a benefit for the library, she and her cousins find out why

While celebrating "Christmas in July," the three cousins come into some stolen art works and discover that even bad boys can be good

When the three cousins find some strange symbols carved in an old tree, they learn about hobo code and the importance of kindness

At Christmas time the three cousins hear a story about a mysterious golden reindeer and wonder if they will be the ones to find it.

Choosing a silver locket with a nightingale engraving to give to her babysitter, who is leaving for college, Sarah-Jane is perplexed when an anonymous benefactor gives the sitter an identical necklace first and must discover the mystery person's identity. IP. Original.

When their neighbors appear to be throwing a birthday party for their dog, the three cousins suspect that things are not what they seem

When Buster the scarecrow disappears before the Fairfield Fall Festival the three cousins set out to find him

A special day camp lets three cousins get a look at what happens behind the scenes at the zoo, which helps them solve a mystery involving an escaping pet snake and a missing diamond ring.