A Christmas gift... that will cost you four dollars.

If, like us, you're a fan of the children's adventure series The 39 Clues, you're in luck: Scholastic is releasing an e-book called The 39 Clues: Cahill Files: Silent Night on Christmas Day. (So... many... hyphens...) The publisher did something similar last season, releasing The 39 Clues: Rapid Fire, a series of seven e-books that answered readers’ questions about the franchise's plot and characters, but this year's effort is a standalone novel "featuring an ancestor of one of The 39 Clues’ main characters. It tells the true World War I story of the Christmas Truce of 1914, during which members of the opposing armies laid down their arms, played soccer, and celebrated the holiday together."

Sounds... heartwarming, I guess. The book will cost $3.99 and include a bonus collectible digital game card (whatever that means), as well as a promotional chapter from Infinity Ring #1: A Mutiny in Time, Scholastic's newest multiplatform series.