Much of the credit for that goes to Craig Allen Smith. He plays Daniel Hillard, an out-of-work actor who disguises himself as a Scottish nanny so he can remain close to his three kids after his divorce from their mother. Complications inevitably ensue, the wheels come off his double life, and Daniel learns a bit about parenthood and marriage along the way. The role demands a chameleon, and it has one in Smith. He clearly was not cast for his singing ability, but he’s able to sustain a manic energy and comic invention throughout a show that’s both a marathon...