Recovering a dropped stitch

To catch a lost stitch, you need ahook.

In thejersey place, knit from the right side until the lost stitch.
Pass the hook through the lost stitch and with the tip of the hook, pick up the horizontal thread just above.

Pull the hook to pass the yarn on the hook through the stitch.

Repeat until you reach the top of the knitting and place the stitch back on the left needle to knit normally.