Gr 4-8-- Hazel Frump spends the week before her 12th birthday tackling two mysteries. She yearns to know more about her mother, who died long ago, and she faces the unexplained disappearance of her father, a Toronto art dealer. Hazel and her younger brother follow their father's paper trail, encountering shady art dealers and a long-lost branch of their family tree. The siblings join their newfound cousins on Ile du Loup in the St. Lawrence River, and together they piece together the hidden truths behind both of Hazel's mysteries. The Martello tower is a structure designed to guard a port or town, and it, too, plays a role in Hazel's discoveries. The novel contains enough red herrings and dead ends to build suspense and draw readers to its lively denouement. The ways in which family and art mix together emotionally ground the story and balance out occasional stilted writing and abrupt transitions. Lanthier has packed the story with a dizzying number of details, and the fact that the children end up without any adult presence seems contrived. That said, the mystery is tightly plotted, the setting emerges distinctly, and the art angle will please fans of Blue Balliett's Chasing Vermeer (Scholastic, 2004).--Caitlin Augusta, The Darien Library, CT[Page 103]. Copyright 2008 Reed Business Information.