Kirk apparently orders a violation of Romulan space, in a scheme to steal a cloaking device.
Kirk appears to lose his judgement and orders the Enterprise into the Neutral Zone, where Romulan warships capture the ship. Spock seems to betray his captain and forms a bond with the Romulan commander, who is a woman. In truth, Kirk is carrying out a secret mission to steal a cloaking device.
The story gives the Romulan commander a prominent role, a rarity in the series. It shows Spock as an operative and gives Kirk a cunning disguise as a Romulan. Fans admire its twisty plot, and it introduces the first cloaking device obtained by the Federation.