A long-lost brother returns . . .

Maddie Harman hasn't seen her brother in years, not since he went off to war and she moved to Sefton Park with their grandparents. So when Theo suddenly returns, Maddie couldn't be happier to have her family back together.

Theo also brings a guest—a stunning mare he's brought back from Zanzibar. Maddie isn't much of a rider, but when Theo lets her name the horse, she falls in love with Firebird. She even dares to go for a ride—and discovers that Firebird is a champion jumper. The horse is fitting in perfectly at the estate.

But Theo doesn't seem so comfortable. And then, on a dark and stormy night, another young man drives up to Sefton Park. He comes inside and introduces himself . . . as Theo Harman. The family is shocked. Who is the real Theo? And Maddie has another worry—if the first Theo is an imposter, what will happen to her beloved Firebird?