The novel "A Cage of Butterflies" can be read as being "a refreshing tale about the power of love, the strength of the human spirit and the power of good over evil. It is proof that humanity does exist in a world, which seems to be increasingly gloomy and filled with ruthless beings motivated by greed and selfishness." This reading accurately describes some of the deeper meanings inside this novel. Brian Caswell has successfully created an undercurrent of love, friendship and trust between the "Think-Tank", the "Babies" as-well-as Susan and Eric. The novel also clearly represents the triumph of good over evil, and that even though the characters are surrounded by gloom, and ruthlessness, rare characteristics such as kindness, and compassion ever present.
This novel displays an undercurrent of love, friendship and trust. People who love each other in this book are obviously Greg and Mikki who at the end of the novel marry, Eric and Susan are another couple represented in the book. The love that Susan had for her deceased brother Richard is the single reason that Susan became involved in the "Facility", as Richard had left some files which Susan had read, containing information regarding the predicament the "Babies" were in. The "Sharing" is also another form of love/friendship this friendship is so strong that the "Babies" would rather die than be separated. These relationships are the basis on which this novel is based, creating a trusting network allowing the group to be successful against all odds.
No matter the difficulties thrust against the main characters in this novel, the ultimate triumph of good over evil is obvious. Larsen and MacIntyre are the researchers at the "Farm", and represent the "Bad guys". Larsen is the manager and MacIntyre his assistant, their blatant cruelty towards the "Babies", although justified in their eyes, is inhumane and forces the "Think-Tank" to take action in order to protect themselves and the "Babies" from harm.