Lin Wanqiu, a college student in Peking, is a well-known talented woman whose father is a patriotic professor. She accidentally helped Chen Mo, an underground party member, pass on information. Chen Mo admired her bravery and invited her to join the organization. The two worked secretly under the supervision of the Japanese army and were nearly arrested many times. They finally succeeded in sending key information, and Lin Wanqiu also grew into a qualified party member.
