"In the two years since his mother was killed in an automobile crash, Colin has been anticipating further disasters, writing down what to do in the event of an avalanche or mentally practicing the Heimlich maneuver just in case--but the real trouble is that his mathematician father is obsessed with a classic math problem and has a hoarding problem that is spiraling out of control, leaving Colin desperate to hide this chaos from his friends and everyone...

Flint Larson has known when he was going to die since he was eight because of the Half-Life Institute, and he is spending the last forty-one days quietly with his divorced parents; September is a vibrant aspiring scientist who wants to cure "half-life", especially since she has met Flint--but their time together is getting short.

After fifteen-year-old Liz Hall is hit by a taxi and killed, she finds herself in a place that is both like and unlike Earth, where she must adjust to her new status and figure out how to "live."