A book aimed at easing separation anxiety and reinforcing bonds.Twins Liza and Jeremy awaken during a thunderstorm and go to their mother for comfort. She reassures them that they're safe and says, "You know we're always together, no matter what," when they object to returning to bed. She then explains that when she was a child her mother told her about the titular "Invisible String," encouraging them to envision it as a link between them no matter what. "People who love each other are always connected by a very special String made of love," she tells them, reinforcing this idea as they proceed to imagine various scenarios, fantastic and otherwise, that might cause them to be separated in body. She also affirms that this string can "reach all the way to Uncle Brian in heaven" and that it doesn't go away if she's angry with them or when they have conflicts. As they go to bed, reassured, the children, who present white, imagine their friends and diverse people around the world connected with invisible strings, promoting a vision of global unity and empathy. While the writing often feels labored and needlessly repetitive, Lew-Vriethoff's playful cartoon art enhances and lightens the message-driven text, which was originally published in 2000 with illustrations by Geoff Stevenson.Sentimental but effective. (Picture book. 3-6) Copyright Kirkus Reviews, used with permission.