LEWISTON – Peter Mars will sign copies of his book “The Key” from 10:30 a.m. to 12:30 p.m. Saturday, July 17, at Mr. Paperback.

Mars was a Boston-area policeman for 12 years before moving to Maine. Mars’ other books include “The Tunnel,” “A Taste For Money” and “The Chaplain” – all novels based on the Boston Police Department.

Customers unable to make the signing may prepurchase a copy to be signed. FMI: call Mr. Paperback at 783-2273.