When a bottle containing a mysterious map washes ashore, Team Unihorn (and Woolly!) are on the case! This is the fourth and final installment of this chapter book graphic novel series perfect for fans of Dog Man and Narwhal and Jelly.Team Unihorn and Woolly have saved Burlap Beach not once, not twice, but three times. Now it's time for them to bask in the sun and enjoy some good 'ole fashioned R&R. And that's exactly what they get--until their cooler accidentally tips over and they discover a map inside a bottle! Where could it lead? Forgotten ruins? Buried treasure? A notable landmark Determined to solve mystery, Team Unihorn (and Woolly!) set off to find what's out there--but the most priceless treasure might be closer than they think.