A Box Full of Murders Books in Order

A Box Full of Murders is Janice Hallett's middle grade mystery series, but it carries the same document-based puzzle energy as her adult books. The setup is simple and very effective: siblings Ava and Luke come across a box of papers, recordings, notebooks, and official records, then realise the material points to an old unsolved crime. From that moment on, they, and the reader, become investigators.

You are meant to solve it too.

That interactive feel is the heart of the series. Instead of a smooth third-person narration, the story arrives in fragments: letters, diary entries, newspaper cuttings, school workbooks, museum records, and secret recordings. In the first book, A Box Full of Murders, the trail begins with a mysterious box in the attic and opens onto a decades-old case. In Death at the Museum, a school trip and a body in a basement pull Ava and Luke into another cold case with fresh danger attached.

Ava and Luke are ordinary kids, not polished child geniuses, and that helps. They ask the questions a curious reader would ask. They compare theories, notice inconsistencies, and keep going when adults have long since stopped looking. Because the cases come to them through old paperwork, the books also let past and present talk to each other, which gives the mysteries a nice extra layer.

The past refuses to stay buried neatly.

Although these are books for younger readers, Hallett does not flatten the mystery or talk down to her audience. The clues matter. Timelines matter. Motives matter. There is real tension, but the tone stays readable and inviting rather than grim. Settings such as an attic full of secrets or a museum with more history than it seems give the books atmosphere without overwhelming the puzzle.

If you have a reader who likes figuring things out, this series makes a strong place to start. The cases are designed so you can play detective alongside Ava and Luke, noticing what they miss or spotting the same clue at the same moment. Reading in order is best, because the siblings' confidence grows from book to book, but each mystery has its own hook. They are clever, fast-moving, and built for readers who want to do more than just watch a detective solve the case.