All About Christmas Eve

S12 E10: After a little girl is mistakenly shot, Pratt and Weaver desperately try to revive her. Meanwhile, Haleh (recurring guest star Yvette Freeman) holds her annual choir tryouts, and everyone is surprised by who is chosen to sing the solo. Eve's (recurring guest star Kristen Johnston) treatment of a patient causes management to get involved. Abby and Kovac exchange Christmas gifts, but Abby's gift to him is bigger than expected.