The Mystery of Shoreline Lighthouse (The Cousin Detective Squad) Paperback – February 26, 2026

"Not all mysteries have villains. Some have heroes."When strange lights flash from a historic lighthouse after dark, nine-year-old detectives Kolbie and Emerson—and their three talented dogs—discover a mystery that will change how they see detective work forever.Summer vacation takes an unexpected turn when cousins Emerson and Kolbie visit their grandfather's coastal cottage. While learning to sail and exploring tide pools, they notice something suspicious at the Shoreline Lighthouse restoration site.Tools vanish overnight. Flashlight beams sweep through the darkened tower. Someone is trespassing after hours—and the lighthouse committee demands answers.Armed with notebooks, binoculars, and their three detective dogs—border collie Jaxx, golden retriever Oliver, and fearless Jack Russell Rizzo—The Cousin Detective Squad begins their most challenging investigation yet. Methodical Emerson organizes the evidence while creative Kolbie sketches the clues.But what they discover will surprise everyone—and teach them that the best detectives don't just solve mysteries. They solve problems.A heartwarming coastal mystery about teamwork, understanding, and finding heroes where no one expects them.Perfect for young readers who love smart, capable girl detectives, adorable dogs who actually help solve mysteries, coastal adventures, and stories about kindness and community. No scary content—ideal for sensitive readers and perfect for independent reading, read-alouds, and classroom libraries.Book 3 in The Cousin Detective Squad Series (Each book is a complete mystery—read in any order!)If you enjoyed The Case of the Neighborhood Night Noises and The Secret of the Library Clock, join Kolbie, Emerson, and their detective dogs on this coastal adventure!Thoughtfully formatted with generous spacing and reader-friendly fonts for confident young readers and comfortable reading at any age. Read more