A lot has changed in 20 years.
Alex and Jeremy treat a constantly ill child and suspect the mother may be the problem.
To see what his life would be like without his special gift, Charlie treats a superstitious farmer without help from his spirit intel.
Alex and Cassie team up to free a young woman from an abusive partner, while Dawn deals with a series of life-threatening complications due to a patient's malfunctioning pacemaker.
Kristine has a stroke and it may be affecting her memories about her past, so Alex and Charlie try bring her some tranquility.
In the fourth-season finale, Charlie's condition worsens and Alex and Shahir strive to keep him alive.
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