The team discovers the remains of a so-called "storm chaser" who seems to have died while following a tornado. Meanwhile, Booth becomes increasingly overprotective of Brennan both at home and in the field, and sleep-deprived Angela and Hodgins come to terms with having Angela's father babysit their infant son.

The remains of an escaped convict are found in a residential sewer, but an examination of the sewer pipes indicates that the murder occurred within prison walls. Brennan insists on solving the crime - despite Booth's pleas for her not to overexert herself - and the expectant couple experiences a very untraditional arrival of their baby daughter.