by Wendy Rosenfield

for the Inquirer

And that's Quintessence's secret for keeping every age engaged. This fully formed production neither condescends to its audience nor betrays its source. Though Mount Airy's Sedgwick Theatre needs a better heating unit (bundle up those kids), onstage there's warmth enough to spare.

Presented by Quintessence Theatre Group at Sedgwick Theater, 7137 Germantown Ave., through Jan. 5. Tickets: $15 to $25. Information: 215-987-4450 or QuintessenceTheatre.org