The Accident Season by Moira Fowley-Doyle

Each fall, Cara’s family enters the accident season – a time when they all become terribly accident-prone .  The rest of the year, her family is just like any other family.  Some years are worse than others, and this year may be the worst one yet.  But Cara, Sam (her ex-step brother), and her best friend Bea are going to try to solve the mystery of the accident season for once and for all.