A person's heart beats faster for a variety of reasons. Some of them are beautiful and optimistic. Others are deceptive and nonsensical, and everyone but us notices this. But what can make the heart of a cardiologist beat faster? Zadie thought that in almost twenty years of friendship she knew everything about her friend Emma. She remembers every day of studying at the medical school, girlish experiences and night terrors. They knew each other well in the past. Too good. However, now that Nick, a former mentor, has returned to their lives, everything has changed. His appearance reminded Emma of the horror that happened to them during their years of study, the fact that almost destroyed the lives of both friends. In Nick's presence, Emma's heart seems to jump out of her chest. From happiness or maybe from fear?