Schooled in Murder

Tom Mason, Chicago area high school teacher, has been teaching at Grover Cleveland High School for a while - long enough to loathe the faculty meetings and long enough to know that as bad as they are, they aren't fatal. Usually.
Having had all he can take of the endless bickering, picking and factional disputes, he sneaks out of the meeting for a short break only to find the meeting over when he returns, the usual suspects having departed to the four winds. Having decided that this was a sign of his good fortune, he decides to see if the stockroom actually has the supplies he needs. What he finds there however is a trysting couple in the dark (one married, the other not) and, once the light is turned on, a dead body in the corner.
The body is that of one of his colleagues who stormed out of the faculty meeting earlier, a blackboard eraser stuffed into her lifeless mouth. Having disappeared from the meeting at roughly the same time, Tom finds himself in the unwelcome position of prime suspect and with the help of his husband, former baseball player Scott Carpenter, he'll have to figure out who really killed the other teacher before the crime is pinned on him.