The River, The Seal, and The Language of Silence

The Carver children travel to Mohenjo-daro, a major city of the ancient Indus Valley Civilization, around 2600–1900 BC, in what is now Pakistan and northwest India.

Yes. Unlike earlier books, Daniel and Elizabeth Carver now know the family's secret and choose to accompany their children to the shed and wait together while the children cross through time.

Yes, it is written for middle-grade readers with no graphic violence; the only tense moments involve a flooded courtyard and general references to disease from unclean water, handled in an educational, non-graphic way.

It covers Indus Valley urban planning, standardized brick construction, citywide drainage and sanitation, the undeciphered Indus script, seal-carving, standardized weights and measures, granaries, and the Great Bath.

They meet Ravi, an apprentice drain-engineer; Ashwin, the master engineer who tests Simeon; Devak, a master seal-carver; his daughters Mira and Priya, who teach Beckah and Ellie their crafts; and Padma, a city healer.

Simeon apprentices with the city's drain engineer and repairs a real household drain; Beckah learns to read the ancient Indus script with Mira's help; Ellie trains as a seal-carver under Priya, learning patience and precision.

Yes—the real Indus script has never been deciphered by modern scholars, which the book uses as the basis for Beckah's storyline of learning to read it directly from the people who used it.

No. Faith is present through the Carver family's prayers, Bible readings, and conversations about the 'Builder' behind the cube's curriculum, but the Maker is never shown or depicted directly.

It is Book 3, following crossings to ancient Egypt and ancient Greece, and continues the family's journey along a thirty-four-destination spiral tied to a growing nine-sided cube.

The river is the Indus, whose floods shaped the valley; the seal refers to the carved stone seals bearing the Indus script; and the 'language of silence' reflects the book's theme that the civilization's quiet, unglamorous infrastructure—not monuments—was its truest form of expression.

No, the book recaps key family history, but readers will appreciate returning references to Egypt and Greece more fully if they've read the earlier books.

Yes, it draws on real features of Mohenjo-daro such as its citadel mound, the Great Bath, granary, standardized brick sizes, and its status as an undeciphered ancient script—dramatized through fictional characters and events.