There's something valuable hidden in Tante Theresa's old treadle machine, and twins Terri and Tim aren't the only ones who know about it. Someone keeps trying to steal it. But no one can find it!

Join Terri and Tim for an exciting summer at the beach filled with adventure. You'll feel the rush of the wind and see as you sail along in The Twosome; experience the thrill and terror of a sailboat regatta that threatens to end in disaster; meet Karen and Chris--another set of twins that means double trouble for Terri and Tim; make exciting discoveries about God in prayer; and on your own detective gear as you help solve the intriguing mystery of the old treadle machine.