This ’80s musical about ’60s-era Liverpool twins separated at birth and mothers with secrets explores social disparities and brotherly bonds. It’s an odd tale that shouldn’t work but ends up a compelling, suspenseful and satisfying show. F, Sa 8pm; Su 7pm. Through 5/19. $18. Green Valley Theatre Company at The Grange Performing Arts Center, 3823 V St., (916) 736-2664; www.greenvalleytheatre.com.