In today’s sew-with-me, I’m working on Block 4 of the 2025 Designer Mystery Block of the Month. I’m at my machine stitching right along with you—cutting, piecing, and pressing as I go—so you can see my real-time process and how I keep everything organized when I’m building a mystery quilt one block at a time. Since it’s a mystery, the fun is in trusting the steps, focusing on clean piecing, and letting the design reveal itself as we move through the months. I also share the practical “sewing room” side of this project—how I approach accuracy, why I slow down on the fiddly parts, and how I keep my blocks consistent so they’ll all fit together later. If you’re sewing along with the Designer Mystery BOM, this is a great checkpoint for Block 4, and if you’re just watching for tips, you’ll still pick up ideas you can use on any block-based quilt. Grab your fabric, get comfy at your machine, and let’s make another block together.