In the sixth book in the Wallace and Grace series, the owls investigate a mysterious egg that appears in the wrong nest.

These best friends are partners in the Night Owl Detective Agency and work together to solve mysteries!

When the robins discover a mysterious egg in their nest, they hire Wallace and Grace to track down where it came from. Tricky clues lead to a bunny, a bear, and even a mouse--but none of those animals lay eggs. Time is running out! Can Wallace and Grace find out whooo the mystery egg belongs to and get it back to the right nest before it hatches?

Young readers will delight in the funny, accessible story, the perfect pathway to chapter books.